al., 1988). G11.4-0.1: Several broad line components are identified in this
SNR. As indicated by the SCC, molecular gases at $\sim$+16.5 and $\sim$+51.3
km s-1 are spatially correlated with radio continuum emission of the remnant,
especially its radio continuum shell peak in the northeast. These molecular
gases belong to the +12.6 and +45.5 km s-1 broad line components,
respectively. The remnant may be associated with either the +12.6 or +45.5 km
s-1 components. Kinematic distances are estimated as 1.25$\pm 0.05$ and
12.4$\pm 0.3$ kpc for the +12.6 km s-1 component, and 3.8$\pm 0.3$ kpc for the
+45.5 km s-1 component. G11.8-0.2: No broad line is identified in this SNR by
full criteria. Three components of broad line candidates are identified in
this SNR by partial criteria. Only the +41.3 km s-1 component shows some
spatial correlation with the remnant. Molecular gas at $\sim$+47.9 km s-1 is
roughly surrounding the southeast of the remnant, where radio continuum
emission is bright. If the remnant is associated with the +41.3 km s-1 MC, its
kinematic distance can be estimated as 3.8$\pm 0.3$ kpc. G12.0-0.1: There is
only one broad line component at +43.5 km s-1 identified in this SNR by full
criteria. Broad line points are mainly distributed on the radio continuum
shell of the remnant in the southeast. The SCC gives no significant spatial
correlation results. The +43.5 km s-1 MC is mainly distributed in the south,
where radio continuum emission is bright. Based on these evidences, we suggest
that the remnant is associated with the +43.5 km s-1 MC, of which the
kinematic distance is estimated as 3.8$\pm 0.3$ kpc. G12.2+0.3: This SNR
presents a partial radio continuum shell in the southeast (Brogan et al.,
2006). Broad 12CO(J=2–1) lines at +50 km s-1 were detected toward this SNR by
Kilpatrick et al. (2016). Here, two broad line components at +20.3 and +30.6
km s-1 are identified in the SNR by full criteria. As indicated by the SCC,
molecular gas at $\sim$+7.6 km s-1 is distributed around the western half of
the remnant, not correlated with the southeastern radio continuum shell. It
probably belongs to the +20.3 km s-1 component. No good spatial correlation
result is found for the +30.6 km s-1 component. We find that molecular gas at
the peak of SCC at $\sim$+49.2 km s-1 is surrounding the southeastern half of
the remnant, correlated with the radio continuum shell well. It belongs to the
+54.1 km s-1 velocity component with broad line candidates identified in the
remnant by partial criteria. This broad line component is also detected in
previous work (see Table LABEL:tab:snrpre). Broad line points at +54.1 km s-1
are located on the remnant’s radio continuum shell peak in the southeast.
Based on these evidences, we suggest that the remnant is associated with the
+54.1 km s-1 component, with the corresponding kinematic distance estimated as
3.9$\pm 0.3$ kpc. Note that we cannot totally rule out the possibility of the
association between the remnant and the +20.3 km s-1 component, of which two
alternative kinematic distances are estimated as 1.2$\pm 0.2$ and 3.9$\pm 0.3$
kpc. G12.5+0.2: In this SNR, broad lines at several velocities are identified
by full criteria. Two broad lines at +53.0 km s-1 may be originated from the
nearby prominent component at +44.6 km s-1. As indicated by the SCC, molecular
gas of the +30.4 km s-1 component shows some spatial correlations with the
remnant, which is distributed around the remnant, mostly in the northeast and
southwest. Moreover, molecular gas at $\sim$+46.5 km s-1 is surrounding the
southeast of the remnant and also distributed around its northern and western
boundaries, which belongs to the +44.6 km s-1 broad line component. Therefore,
the remnant may be associated with either the +30.4 or +44.6 km s-1
components. Kinematic distances are estimated as 2.9$\pm 0.3$ kpc for the
+30.4 km s-1 component and 3.8$\pm 0.2$ kpc for the +44.6 km s-1 component.
G12.7-0.0: This SNR presents three sections of partial radio continuum shells
in the northeast, southeast, and west, and the southeastern one is the
longest. There is only one broad line at +9.1 km s-1 identified in the remnant
by full criteria. Molecular gas at a minor peak at $\sim$+0.2 km s-1 belonging
to the +9.1 km s-1 component is distributed around the northern boundary of
the remnant; however, it is not well correlated with the remnant’s radio
continuum emission. Molecular gas at the significant peak of the SCC at
$\sim$+57.8 km s-1 is roughly surrounding the southeastern half of the
remnant, following the southeastern radio shell. It belongs to the +53.0 km
s-1 component that is with many broad line candidates identified in the
remnant by partial criteria. We find that most of the broad line candidates at
+53.0 km s-1 are distributed within the remnant; furthermore, they are mainly
distributed around the southeastern radio continuum shell. For the +53.0 km
s-1 component, both the distribution of molecular gas as well as locations of
broad line candidates are correlated with radio continuum emission of the
remnant. It strongly indicates that the remnant is associated with the +53.0
km s-1 MC, of which the kinematic distance is estimated as 3.8$\pm 0.3$ kpc.
G12.8-0.0: We identify only one broad line at +11.1 km s-1 in this SNR by full
criteria; however, corresponding molecular gas shows no good spatial
correlation with the remnant. As indicated by the SCC, molecular gas of the
+21.3 km s-1 component is roughly surrounding the remnant, which is with broad
line candidates identified in the remnant by partial criteria. Moreover,
molecular gases at $\sim$+32.1 and $\sim$+49.5 km s-1 are roughly surrounding
the north and east of the remnant but at a distance, respectively. They belong
to the +38.0 and +47.2 km s-1 components, respectively, both of which are with
broad line candidates identified in the remnant by partial criteria. Based on
these evidences, the remnant is probably associated with the +21.3 km s-1
component with the kinematic distance estimated as 13.4$\pm 0.3$ kpc.
Nevertheless, we cannot exclude the possibility of the association between the
remnant and either the +38.0 or +47.2 km s-1 components. The near and far
kinematic distances of the +38.0 km s-1 component are estimated as 3.9$\pm
0.3$ and 12.4$\pm 0.3$ kpc, respectively, and the kinematic distance of the
+47.2 km s-1 component is estimated as 3.9$\pm 0.3$ kpc. G13.3-1.3: The
northwest of this SNR overlaps with SNRC G13.10-0.50. Broad lines at multiple
velocities are identified in the remnant by full criteria. Broad lines at
+20.6 km s-1 can be attributed to the nearby prominent component at +15.4 km
s-1, and broad lines at +33.7, +45.2, and +51.8 km s-1 may be originated from
the nearby prominent component at +42.7 km s-1. As indicated by the SCC,
molecular gases at $\sim$+14.0 and $\sim$+29.2 km s-1, belonging to the +15.4
km s-1 broad line component, are surrounding the north of the remnant.
Moreover, molecular gas at the peak of the SCC at $\sim$+41.3 km s-1 is
roughly surrounding the northwest of the remnant, which belongs to the +42.7
km s-1 broad line component. Based on these evidences, the remnant may be
associated with either the +15.4 or +42.7 km s-1 components. Kinematic
distances of them are estimated as 1.25$\pm 0.06$ and 3.6$\pm 0.5$ kpc,
respectively. G13.5+0.2: Broad lines at +17.9, +24.9, and +38.9 km s-1 are
identified in this SNR by full criteria. As indicated by the SCC, molecular
gas of the +17.9 km s-1 component is roughly surrounding the eastern half of
the remnant. Molecular gas of the +38.9 km s-1 component is also distributed
around the remnant. No good spatial correlation result is found for the +24.9
km s-1 component. The remnant may be associated with either the +17.9 or +38.9
km s-1 components, and corresponding kinematic distances are estimated as
1.8$\pm 0.1$ kpc and 3.8$\pm 0.3$ kpc, respectively. G14.1-0.1: This SNR
presents bright radio continuum emission in the northwest. Broad lines at
+37.9 km s-1 are identified in the SNR. Some broad lines may be originated
from a large overlapped H ii region. As indicated by the SCC, molecular gas at
$\sim$+47.1 km s-1 belonging to the +37.9 km s-1 component is distributed
around the remnant, mostly in the northwest. Molecular gas at the peak of the
SCC at $\sim$+58.1 km s-1 is distributed around the remnant, however, no
corresponding broad line is identified in the remnant even by partial
criteria. Based on these evidences, we suggest that the remnant is associated
with the +37.9 km s-1 component, of which the kinematic distance is estimated
as 3.9$\pm 0.3$ kpc. G15.1-1.6: One broad line at +62.7 km s-1 is identified
in this SNR. As indicated by the SCC, molecular gas of the +62.7 km s-1
component is roughly surrounding the north of the remnant. Molecular gas at
the nonsignificant peak of the SCC at $\sim$+19.0 km s-1 is distributed around
the northeastern and southwestern boundaries of the remnant; however, there is
no corresponding broad line identified in the remnant even by partial
criteria. The remnant is probably associated with the +62.7 km s-1 component,
of which the near and far kinematic distances are estimated as 3.8$\pm 0.7$
and 10.4$\pm 1.8$ kpc, respectively. G15.4+0.1: Molecular gases at +34 and
+47.8 km s-1 were found to be spatially correlated with this SNR (Castelletti
et al., 2013; Sofue et al., 2021), however, H i spatial correlations and
absorption results indicate an association with the +60 km s-1 cloud
(Castelletti et al., 2013; Supan et al., 2015). Here, two components at +30.9
and +46.8 km s-1 are with broad lines identified in the SNR. Some broad lines
at +46.8 km s-1 may be originated from the nearby prominent +30.9 km s-1
component. As indicated by the SCC, molecular gas at $\sim$+34.3 km s-1 is
roughly surrounding the southern half of the remnant, which belongs to the
+30.9 km s-1 broad line component. The +46.8 km s-1 component is not well
spatially correlated with the remnant. Therefore, we suggest that the remnant
is associated with the +30.9 km s-1 MC. No H i absorption around the tangent
point velocity shown by Castelletti et al. (2013) indicates that the SNR is
located at a near kinematic distance. The near kinematic distance of the +30.9
km s-1 MC is estimated as 3.0$\pm 0.4$ kpc. G15.9+0.2: Broad lines at two
velocities are identified in this SNR, nevertheless, only one broad line at
+29.1 km s-1 can be attributed to the nearby +26.4 km s-1 component. As
indicated by the SCC, molecular gas of the +26.4 km s-1 component is roughly
surrounding the remnant, correlated with its radio continuum emission. This
spatial correlation was also found in previous work (see Table
LABEL:tab:snrpre). Based on the kinematic evidence as well as the spatial
correlation result, we suggest that the remnant is associated with the +26.4
km s-1 MC, of which the near and far kinematic distances are estimated as
3.1$\pm 0.4$ and 13.3$\pm 0.3$ kpc, respectively. G16.0-0.5: This SNR is
discussed in Section 3.3.3. G16.4-0.5: There are three components with broad
lines identified in this SNR by full criteria. Some broad lines at +39.5 km
s-1 may be originated from an overlapped H ii region. As indicated by the SCC,
molecular gases at $\sim$+14.8 and $\sim$+20.2 km s-1, belonging to the +23.6
km s-1 velocity component, are roughly surrounding the northeast of the
remnant and distributed around the remnant, respectively. No good spatial
correlation result is found for other velocity components. Based on identified
broad lines as well as the spatial correlation result, we suggest that the
remnant is associated with the +23.6 km s-1 MC, of which the kinematic
distance is estimated as 3.2$\pm 0.4$ kpc. G16.7+0.1: Both OH 1720 MHz maser
emission at $\sim$+20 km s-1 and broad 12CO(J=2–1) lines at +25 km s-1 were
detected in this SNR (Green et al., 1997; Hewitt et al., 2008; Kilpatrick et
al., 2016, see Table LABEL:tab:snrpre for more information). Here, three broad
line components are identified in the SNR at +29.8, +43.8, and +63.3 km s-1.
There are broad line points at +29.8 km s-1 located near the position of the
OH 1720 MHz maser detected by Green et al. (1997). As indicated by the SCC,
molecular gas at $\sim$+19.5 km s-1 is distributed around the remnant, which
belongs to the +29.8 km s-1 component. For the +43.8 km s-1 component,
molecular gas at $\sim$+47.3 km s-1 is roughly surrounding the whole remnant.
The +63.3 km s-1 component shows no good spatial correlation with the remnant.
We also find that molecular gas at $\sim$+84.3 km s-1 is surrounding the north
of the remnant; however, no corresponding broad line is identified in the
remnant even by partial criteria. Based on the kinematic and spatial
correlation evidences, the remnant is probably associated with the +29.8 km
s-1 component, or may be associated with the +43.8 km s-1 component. Kinematic
distances are estimated as 13.2$\pm 0.3$ kpc for the +29.8 km s-1 component
and 4.0$\pm 0.3$ for the +43.8 km s-1 component. G17.0-0.0: Only one broad
line component at +30.4 km s-1 is identified in this SNR by full criteria. As
indicated by the SCC, molecular gas of the +30.4 km s-1 component is
distributed around the remnant. Molecular gas at $\sim$+94.0 km s-1 is roughly
surrounding the southwestern half of the remnant, which is probably a part of
a molecular hub-filament structure. Based on the kinematic distance as well as
the spatial correlation result, we suggest that the remnant is associated with
the +30.4 km s-1 component, of which the kinematic distance is estimated as
12.1$\pm 0.3$ kpc. G17.4-0.1: Two broad line components at +41.2 and +65.6 km
s-1 are identified in this SNR. Only one broad line at +65.6 km s-1 is
probably originated from an overlapped H ii region. Molecular gas at a minor
peak of the SCC at $\sim$+39.8 km s-1 is distributed around the northeastern
and southwestern boundaries of the remnant, which belongs to the +41.2 km s-1
component. If the remnant is associated with the +41.2 km s-1 component, its
near and far kinematic distances can be estimated as 3.2$\pm 0.3$ and 12.0$\pm
0.3$ kpc, respectively. G17.4-2.3: This SNR presents a partial radio continuum
shell in the southwest. OH 1720 MHz line emission was detected in the SNR (see
Table LABEL:tab:snrpre). Only one component at +22.6 km s-1 is with broad
lines identified in the remnant by full criteria. Molecular gas at the SCC
peak at $\sim$+18.4 km s-1 is distributed around the southwestern and northern
boundaries of the remnant, which belongs to the +22.6 km s-1 component.
Therefore, we suggest that the remnant is associated with the +22.6 km s-1 MC,
accordingly, its kinematic distance can be estimated as 1.5$\pm 0.1$ kpc.
G17.8-2.6: There is no broad line identified in this SNR even by partial
criteria. At the peak of the SCC at $\sim$+7.5 km s-1, there is little
molecular gas distributed around the remnant but not well correlated.
Considering that OH 1720 MHz line emission was detected in the remnant in a
previous work (see Table LABEL:tab:snrpre), the remnant may be associated with
molecular gas at $\sim$+7.5 km s-1 with the kinematic distance estimated as
0.26$\pm 0.14$ kpc. G18.1-0.1: Three broad line components at +50.0, +77.0,
and +94.1 km s-1 are identified in this SNR by full criteria. Molecular gas at
the peak of the SCC at $\sim$+79.4 km s-1 is distributed around the
northeastern and western boundaries of the remnant, which belongs to the +77.0
km s-1 component. There is only one broad line identified for the +77.0 km s-1
component. As indicated by the SCC, molecular gas of the +50.0 km s-1
component is roughly surrounding the southeastern half of the remnant. For the
+94.1 km s-1 component, nine broad line points are identified in the remnant,
and no broad line point is identified outside the remnant. The overall spatial
distribution of the +94.1 km s-1 component is not well correlated with the
remnant. However, there is a molecular clump belonging to the +94.1 km s-1
component that is located on the eastern boundary of the remnant, where radio
continuum emission is bright. The association between the remnant and the
+94.1 km s-1 component is also supported by H i absorption results in previous
works (see Table LABEL:tab:snrpre). Molecular gas at $\sim$+14.0 km s-1 is
roughly surrounding the southwest of the remnant; however, no corresponding
broad line is identified in the remnant even by partial criteria. Therefore,
the remnant is probably associated with the +94.1 km s-1 component, or may be
associated with the +50.0 or +77.0 km s-1 components. As shown in previous
works, the lack of H i absorption around the tangent point velocity toward the
SNR indicates that the SNR is at a near kinematic distance (Leahy et al.,
2014; Johanson & Kerton, 2009; Ranasinghe & Leahy, 2018b). The near kinematic
distance of the +94.1 km s-1 component is estimated as 5.9$\pm 1.4$ kpc, and
that of the +50.0 and +77.0 km s-1 components are estimated as 4.0$\pm 0.4$
and 4.2$\pm 0.4$ kpc, respectively. G18.6-0.2: Broad 12CO(J=2–1) lines at +42
km s-1 were detected toward this SNR by Kilpatrick et al. (2016). Here, two
broad line components at +46.7 and +64.6 km s-1 are identified in the SNR. The
SCC peaks at $\sim$+49.5 km s-1, where molecular gas is distributed around the
remnant. Molecular gas at a minor peak of the SCC at $\sim$+66.5 km s-1 is
surrounding the remnant except for its northwest side, correlated well with
its shell-like radio continuum emission, which belongs to the +64.6 km s-1
component. Broad lines around +46.7 km s-1 and the spatial correlation between
the remnant and molecular gas at $\sim$+66.5 km s-1 were also found in
previous work (see Table LABEL:tab:snrpre). The association between the
remnant and the +64.6 km s-1 component is also supported by H i absorption
results in previous works (see Table LABEL:tab:snrpre). Based on these
evidences, the remnant is probably associated with the +64.6 km s-1 component,
or may be associated with the +46.7 km s-1 component. The kinematic distance
of the +46.7 km s-1 component is estimated as 4.1$\pm 0.4$ kpc, and that of
the +64.6 km s-1 component is estimated as 3.9$\pm 0.4$ kpc. Note that the
lack of H i absorption around the tangent point velocity toward this SNR shown
by Johanson & Kerton (2009), Ranasinghe & Leahy (2018b) supports the near
kinematic distances obtained here. G18.8+0.3 (Kes 67): High-$J$ CO lines were
detected toward this SNR, which, together with their spatial correlations,
indicate that the remnant is in association with $\sim$+20 km s-1 MC (e.g.,
Dubner et al., 2004; Paron et al., 2015, see Table LABEL:tab:snrpre for more
information). Here, broad lines at +20.4 and +124.6 km s-1 are identified in
the SNR. Most of the broad line points at +20.4 km s-1 are distributed around
the southern boundary of the remnant. Molecular gases at peaks of the SCC at
$\sim$+11.4 and $\sim$+17.6 km s-1 are distributed around the southwestern
boundary of the remnant, which belongs to the +20.4 km s-1 component. Only one
broad line is identified for the +124.6 km s-1 component, and the +124.6 km
s-1 component shows no good spatial correlation with the remnant. At the peak
of the SCC at $\sim$+4.6 km s-1, there are two roughly parallel molecular
filaments, which extend far beyond the remnant and are partly surrounding the
north and south of the remnant. No corresponding broad line around +4.6 km s-1
is identified in the remnant even by partial criteria. Based on identified
broad lines and the spatial correlation result, we suggest that the remnant is
associated with the +20.4 km s-1 MC. This result is consistent with that in
previous works, where H i and CO morphologies, H i absorption spectra, and
high-$J$ CO lines were studied (see Table LABEL:tab:snrpre). Based on H i
absorption results, Tian et al. (2007a) indicated that the SNR is at a far
kinematic distance. The far kinematic distance of the +20.4 km s-1 MC is
estimated as 13.3$\pm 0.3$ kpc. G18.9-1.1: A spatial correlation between this
SNR and the MC at +25.6 km s-1 was found (Traverso et al., 1999), and H i
absorption features were detected up to $\sim$+23 km s-1 (Furst et al., 1989;
Ranasinghe et al., 2020). Nevertheless, near-infrared H2 lines were detected
at +70 km s-1 by Lee et al. (2020). Here, broad lines at +44.7, +56.0, and
+64.4 km s-1 are identified in the SNR by full criteria. There is only one
broad line at +56.0 km s-1, which is probably originated from the nearby
prominent component at +64.4 km s-1. As indicated by the SCC, molecular gas of
the +64.4 km s-1 component is roughly surrounding the north of the remnant,
where radio continuum emission is bright. Molecular gases at $\sim$+6.2 and
$\sim$+26.0 km s-1 are distributed around the northwestern and eastern
boundaries of the remnant, respectively; however, there is no corresponding
broad line identified in the remnant even by partial criteria. We find no good
spatial correlation between the remnant and the +44.7 km s-1 component. Based
on these evidences, we suggest that the remnant is associated with the +64.4
km s-1 MC, with the kinematic distance estimated as 3.8$\pm 0.4$ kpc. The near
kinematic distance obtained here is consistent with the H i absorption result
in previous work (Ranasinghe et al., 2020). G19.1+0.2: Many velocity
components have broad lines identified in this SNR by full criteria. As
indicated by the SCC, molecular gas of the +56.8 km s-1 broad line component
is distributed around the southwestern half of the remnant, where its radio
continuum emission is bright. Molecular gas of the +112.7 km s-1 broad line
component is roughly surrounding the south of the remnant. However, broad
lines are identified at +56.8 km s-1 but not at +112.7 km s-1 by full criteria
plus the clean subbackground region condition. At the peak of the SCC at
$\sim$+5.4 km s-1, many molecular gases are distributed within the remnant. No
good spatial correlation result is found for other broad line components.
Based on these evidences, we suggest that the remnant is associated with the
+56.8 km s-1 component, and its kinematic distance is estimated as 4.2$\pm
0.5$ kpc. Note that we cannot totally rule out the possibility of the
association between the remnant and the +112.7 km s-1 component, of which the
kinematic distance is estimated as 9.5$\pm 0.4$ kpc. G20.0-0.2: The south of
this SNR overlaps with SNRC G19.96-0.33. Three broad line components are
identified in the remnant, i.e. +40.8, +65.8, and +88.5 km s-1. There is only
one broad line at +40.8 km s-1, which may be associated with overlapped H ii
regions. There are many broad lines at +65.8 km s-1 outside the overlapping
regions with H ii regions and the SNRC. Molecular gas at a peak of the SCC at
$\sim$+73.2 km s-1, which belongs to the +65.8 km s-1 component, is roughly
surrounding the northwestern half of the remnant. In addition, at the peak of
the SCC at $\sim$+65.6 km s-1, an elongated molecular clump is roughly
distributed along the western boundary of the remnant. Molecular gases of
other broad line components show no good spatial correlation with the remnant.
The kinematic evidence as well as the spatial correlation result indicates an
association between the remnant and the +65.8 km s-1 MC. The result here is
consistent with CO morphology and H i absorption results from previous studies
(see Table LABEL:tab:snrpre). Considering the presence of H i absorption at
the tangent point velocity shown by Ranasinghe & Leahy (2018b), the kinematic
distance of the SNR is estimated as 10.6$\pm 1.3$ kpc. G21.0-0.4: There is
only one component at +41.2 km s-1 with broad lines identified in this SNR.
Note that some broad lines may be originated from a large overlapped H ii
region. Broad line points are mainly distributed around the remnant. Molecular
gas at a minor peak of the SCC at $\sim$+49.8 km s-1, which belongs to the
+41.2 km s-1 component, is distributed around the southeastern and northern
boundaries of the remnant. Based on these evidences, we suggest that the
remnant is associated with the +41.2 km s-1 MC with the kinematic distance
estimated as 3.4$\pm 0.4$ kpc. G21.5-0.9: Ranasinghe & Leahy (2018b), Tian &
Leahy (2008) suggest an association between this SNR and the $\sim$+68 km s-1
cloud, based on H i absorption results (see Table LABEL:tab:snrpre for more
information). Here, no broad line is identified in the SNR by full criteria.
As indicated by the SCC, molecular gases at $\sim$+54.6 and $\sim$+58.6 km s-1
are roughly surrounding the remnant. It supports the association between the
remnant and the +56.0 km s-1 component that is with broad line candidates
identified in the remnant by partial criteria. If the remnant is associated
with the +56.0 km s-1 MC, its kinematic distance can be estimated as 3.4$\pm
0.3$ kpc. The near kinematic distance obtained here is consistent with the H i
absorption result in previous works (Tian & Leahy, 2008; Ranasinghe & Leahy,
2018b, and references therein). G21.6-0.8: Broad lines at three velocities are
identified in this SNR. As indicated by the SCC, molecular gases at
$\sim$+49.5 and $\sim$+63.5 km s-1 are distributed around the remnant, which
belong to the +52.5 km s-1 broad line component. No good spatial correlation
is found for other broad line components. Therefore, we suggest that the
remnant is associated with the +52.5 km s-1 MC and locates at a kinematic
distance of 3.4$\pm 0.3$ kpc. G21.8-0.6 (Kes 69): Several components are with
broad lines identified in this SNR. Broad lines at +71.7 km s-1 can be
attributed to the nearby prominent component at +83.2 km s-1. Only the +83.2
km s-1 component is with broad line points distributed on radio continuum
shells of the remnant in the northeast and southwest. Extended OH 1720 MHz
maser emission at $\sim$+84 km s-1 was also detected around the southwestern
radio continuum shell (see Table LABEL:tab:snrpre). Molecular gas at
$\sim$+66.5 km s-1 is roughly surrounding the southwest of the remnant, which
seems to belong to the +83.2 km s-1 component. There is molecular gas of the
+83.2 km s-1 component distributed along radio continuum shells and also
inside the remnant. No good spatial correlation result is found for other
velocity components. The SCC peaks at +44.8 km s-1, where filamentary
molecular gas is distributed inside the remnant. These evidences indicate an
association between the remnant and the +83.2 km s-1 MC, of which the
kinematic distance is estimated as 4.4$\pm 0.7$ kpc. The result here is
consistent with previous multiband studies (see Table LABEL:tab:snrpre).
G22.7-0.2: Broad CO lines were detected in this SNR, indicating its
association with the +77 km s-1 MC (Su et al., 2014b, see Table
LABEL:tab:snrpre for more information). Here, we identify numerous broad line
components in the SNR by full criteria. Some broad lines are probably
originated from overlapped H ii regions. When using full criteria plus the
clean subbackground region condition, only two broad line components at +73.1
and +106.4 km s-1 are identified in the SNR. As indicated by the SCC,
molecular gas at $\sim$+77.1 km s-1, belonging to the +73.1 km s-1 broad line
component, is surrounding radio continuum emission of the remnant in the
southeast very well. Molecular gas at the peak of the SCC at $\sim$+6.3 km s-1
is distributed around the eastern boundary of the remnant but not well
correlated. No good spatial correlation is found for other velocity
components. Therefore, we suggest that the remnant is associated with the
+73.1 km s-1 MC with the kinematic distance estimated as 4.6$\pm 0.5$ kpc.
This is consistent with results in previous works (see Table
LABEL:tab:snrpre). G23.3-0.3 (W41): Many broad line components are identified
in this SNR even by full criteria plus the clean subbackground region
condition. Broad lines at +52.8 and +77.5 km s-1 can be attributed to nearby
prominent components at +56.6 and +74.1 km s-1, respectively. More than two
hundreds points in the remnant are with broad lines identified at +74.1 km
s-1, but very few outside the remnant. Most of these broad line points are
located on radio continuum shells of the remnant, and some of them are located
in overlapped H ii regions. Furthermore, OH 1720 MHz line emission at +71 km
s-1 was detected in this remnant (see Table LABEL:tab:snrpre). The +74.1 km
s-1 component is not well spatially correlated with the remnant. There is
molecular gas of the +74.1 km s-1 component distributed around radio continuum
shells of the remnant, nevertheless, there is also a lot of molecular gas of
the component distributed in the remnant, which is associated with overlapped
H ii regions. As indicated by the SCC, molecular gas at $\sim$+52.1 km s-1,
belonging to the +56.6 km s-1 component, is distributed along two bright radio
continuum filaments of the remnant in the west. Molecular gas at the
nonsignificant peak of the SCC at $\sim$+8.7 km s-1 is roughly surrounding the
southeast of the remnant; however, it is not well correlated with radio
continuum emission of the remnant. No good spatial correlation result is found
for other broad line components. Based on these evidences, the remnant may be
associated with either the +56.6 or +74.1 km s-1 components. Kinematic
distances are estimated as 3.5$\pm 0.4$ kpc for the +56.6 km s-1 component and
4.8$\pm 0.6$ kpc for the +74.1 km s-1 component. The near kinematic distances
obtained here are consistent with the H i absorption result in previous works
(Ranasinghe & Leahy, 2018b, and references therein). G24.7-0.6: Broad lines at
+57.9 and +97.3 km s-1 are identified in this SNR. The +97.3 km s-1 component
is with only one broad line point identified, and shows no good spatial
correlation with the remnant. As indicated by the SCC, the remnant is
spatially correlated with molecular gas at $\sim$+51.4 km s-1, which is
roughly surrounding the remnant. It supports the association between the
remnant and the +57.9 km s-1 component. Therefore, we suggest that the remnant
is associated with the +57.9 km s-1 MC with the kinematic distance estimated
as 3.7$\pm 0.4$ kpc. The near kinematic distance obtained here is consistent
with the H i absorption result in previous work (Ranasinghe & Leahy, 2018a).
G24.7+0.6: Sofue et al. (2021) found a spatial correlation between this SNR
and molecular gas at +112 km s-1. Here, there are several broad line
components identified in the SNR even by full criteria plus the clean
subbackground region condition. Some broad lines at +102.6 km s-1 are
originated from overlapped H ii regions. At peaks of the SCC at $\sim$+7.0 and
$\sim$+43.2 km s-1, molecular gases are distributed around the remnant and
also inside it, which are not well correlated with the remnant. As indicated
by the SCC, the +17.5 and +114.9 km s-1 broad line components also show some
spatial correlations with the remnant. For the +17.5 km s-1 component, broad
line points are located on the remnant’s partial radio shells in the east and
west. Molecular gas at $\sim$+16.3 km s-1 belonging to the +17.5 km s-1
component is also distributed around the remnant’s radio continuum shells.
Molecular gas at $\sim$+113.0 km s-1 is distributed around the southern
boundary of the remnant but not well correlated with the remnant’s radio
continuum emission. Broad lines at +114.9 and +106.8 km s-1 are probably
originated from a molecular hub-filament structure overlapping the south of
the remnant. Therefore, we suggest that the remnant is associated with the
+17.5 km s-1 MC, and the corresponding kinematic distance is estimated as
1.6$\pm 0.3$ kpc. The near kinematic distance obtained here is consistent with
the H i absorption result in previous work (Ranasinghe et al., 2018).
G25.1-2.3: Only one component at +53.1 km s-1 is with broad lines identified
in this SNR. At a peak of the SCC at $\sim$+53.8 km s-1, molecular gas is
distributed around the northern shell-like radio continuum emission of the
remnant. Molecular gas at the peak of the SCC at $\sim$+10.0 km s-1 is roughly
surrounding the southwestern radio continuum shell of the remnant; however, no
corresponding broad line is identified in the remnant even by partial
criteria. Therefore, we suggest that the remnant is associated with the +53.1
km s-1 MC with the kinematic distance estimated as 3.9$\pm 0.8$ kpc. G27.4+0.0
(Kes 73, 4C-04.71): Broad 12CO(J=2–1) lines at +100 km s-1 and near-infrared
H2 lines at +99 km s-1 were detected toward this SNR (Kilpatrick et al., 2016;
Lee et al., 2020, see Table LABEL:tab:snrpre for more information). We find
only one component at +99.3 km s-1 with broad lines identified in the SNR by
full criteria. Molecular gas at a peak of the SCC at $\sim$+103.3 km s-1 is
surrounding the northeast of the remnant, which belongs to the +99.3 km s-1
component. At the peak of the SCC at $\sim$+76.4 km s-1, there are several
molecular clumps distributed around the remnant but not well correlated. Based
on these evidences, the remnant is probably associated with the +99.3 km s-1
MC. Ranasinghe & Leahy (2018b) find no H i absorption around the tangent point
velocity, indicating that the SNR is at a near kinematic distance. The near
kinematic distance of the +99.3 km s-1 MC is estimated as 6.0$\pm 0.6$ kpc.
G27.8+0.6: Multiple broad line components are identified in this SNR even by
full criteria plus the clean subbackground region condition. Broad lines at
+99.8 and +105.1 km s-1 can be attributed to the nearby prominent component at
+97.0 km s-1. Some broad lines at +35.7 and few at +97.0 km s-1 are probably
originated from two overlapped H ii regions. As indicated by the SCC, the
+97.0 km s-1 component is spatially correlated with the southern radio
continuum emission of the remnant well. Molecular gases at $\sim$+10.0 and
$\sim$+41.0 km s-1 are distributed around the northeastern and southern
boundaries of the remnant, respectively. However, these molecular gases are
not correlated with the southern radio continuum emission of the remnant.
There are also molecular clumps at $\sim$+68.9 km s-1 distributed around the
eastern boundary of the remnant but mostly inside it. No good spatial
correlation is found for other velocity components. Therefore, we suggest that
the remnant is associated with the +97.0 km s-1 MC, and the near and far
kinematic distances are estimated as 5.3$\pm 1.0$ and 8.1$\pm 0.5$ kpc,
respectively. G28.6-0.1: Broad lines at +74.9 and +94.3 km s-1 are identified
in this SNR by full criteria. Some broad lines at +74.9 km s-1 are probably
originated from the nearby +94.3 km s-1 component. As indicated by the SCC,
molecular gas of the +94.3 km s-1 component is distributed around the remnant,
mostly surrounding the southwestern half of it. No good spatial correlation
result is found for the +74.9 km s-1 component. These evidences indicate an
association between the remnant and the +94.3 km s-1 component, of which the
kinematic distance is estimated as 8.1$\pm 0.5$ kpc. The far kinematic
distance obtained here is consistent with the H i absorption result in
previous work (Ranasinghe & Leahy, 2018a). G28.8+1.5: There is only one
component at +11.7 km s-1 with broad lines identified in this SNR by full
criteria. As indicated by the SCC, molecular gas at $\sim$+5.7 km s-1 is
distributed around the remnant, which belongs to the +11.7 km s-1 component.
These evidences indicate that the remnant is associated with the +11.7 km s-1
MC, and the corresponding kinematic distance is estimated as 0.4$\pm 2.2$ or
1.6$\pm 0.3$ kpc. G29.6+0.1: Broad 12CO(J=2–1) lines at +94 km s-1 were
detected toward this SNR by Kilpatrick et al. (2016) (see Table
LABEL:tab:snrpre for more information). We identify three broad line
components in the SNR by full criteria. There are more points with broad lines
identified for the +80.4 km s-1 component than the other two components. As
indicated by the SCC, the +80.4 and +97.0 km s-1 components show some spatial
correlations with the remnant. Molecular gas at $\sim$+86.0 km s-1 belonging
to the +80.4 km s-1 component is roughly surrounding the eastern half of the
remnant. Molecular gas of the +97.0 km s-1 component is distributed around the
remnant except for its northwest side. Note that molecular gas at the peak of
the SCC at $\sim$+65.1 km s-1 is roughly surrounding the whole remnant except
for its east side; however, no corresponding broad line is identified even by
partial criteria. Molecular gas at another peak of the SCC at $\sim$+42.2 km
s-1 is mainly distributed in the remnant but not well correlated. Therefore,
the remnant may be associated with either the +80.4 or +97.0 km s-1
components. As shown by Ranasinghe et al. (2018), there is no H i absorption
at the tangent point velocity, indicating that the SNR is at a near kinematic
distance. The kinematic distance of the +80.4 km s-1 component is estimated as
4.5$\pm 0.5$ kpc, of which the near kinematic distance is consistent with the
H i absorption result. For the +97.0 km s-1 component, the near kinematic
distance is estimated as 4.8$\pm 0.5$ kpc, consistent with that of the +80.4
km s-1 component. G29.7-0.3 (Kes 75): Su et al. (2009), Kilpatrick et al.
(2016) studied CO line emission toward this SNR, and found broad line features
around +54 km s-1. On the other hand, Leahy & Tian (2008a), Ranasinghe & Leahy
(2018b) analyzed H i absorption spectra toward the SNR, and found no
significant H i absorption feature for a 13CO velocity component at $\sim$+102
km s-1. Together with a significant H i absorption feature at $\sim$+95 km
s-1, they suggest an LSR velocity range of $\sim$95–102 km s-1. Nevertheless,
the H i absorption at $\sim$+102 km s-1 is not strong but still exists as
suggested by Su et al. (2009), hence, H i absorption features no longer
provide strong constrains on the LSR velocity of the SNR. These indicate
complicated ISM distributions toward the remnant (see Table LABEL:tab:snrpre
for more information). Here, there is only one broad line component at +87.3
km s-1 identified in the SNR by full criteria. As indicated by the SCC, the
+87.3 km s-1 component also shows some spatial correlations with the remnant,
of which molecular gas is roughly surrounding the remnant. Note that multiple
components are with broad line candidates identified in the remnant by partial
criteria, e.g., at +53.7 km s-1. Based on evidences we found here, the remnant
is probably associated with the +87.3 km s-1 component, of which the kinematic
distance is estimated as 4.6$\pm 0.6$ kpc. G30.7+1.0: Three velocity
components at +29.9, +51.1, and +80.5 km s-1 are with broad lines identified
in this SNR. As indicated by the SCC, the +51.1 and +80.5 km s-1 components
are spatially correlated with the remnant. Molecular gas at $\sim$+49.2 km s-1
is roughly surrounding the remnant. Molecular gas at $\sim$+80.8 km s-1 is
surrounding the south of the remnant. If the remnant is associated with the
+51.1 km s-1 component, the near and far kinematic distances are estimated as
3.4$\pm 1.0$ and 10.7$\pm 0.9$ kpc, respectively. If associated with the +80.5
km s-1 component, the near and far kinematic distances are estimated as
3.7$\pm 0.5$ and 7.6$\pm 3.3$ kpc, respectively. G30.7-2.0: There is only one
broad line component at +80.3 km s-1 identified in this SNR by full criteria.
Molecular gas at the peak of the SCC at $\sim$+8.7 km s-1 is roughly
surrounding the remnant except for its east side, which belongs to the +7.5 km
s-1 component with broad line candidates identified in the remnant by partial
criteria. Molecular gas of the +80.3 km s-1 component is mainly distributed in
the east of the remnant but not well correlated. The remnant is probably
associated with the +7.5 km s-1 component, or may be associated with the +80.3
km s-1 component. Corresponding kinematic distances are estimated as 0.24$\pm
0.02$ and 7.8$\pm 2.2$ kpc, respectively. G31.5-0.6: Two broad line components
at +81.7 and +95.8 km s-1 are identified in this SNR by full criteria. As
indicated by the SCC, molecular gas at $\sim$+79.4 km s-1 is roughly
surrounding the north of the remnant, which belongs to the +81.7 km s-1
component. Molecular gas at $\sim$+106.5 km s-1 component is distributed
around the eastern boundary of the remnant, which belongs to the +95.8 km s-1
component. The remnant may be associated with either the +81.7 or +95.8 km s-1
components, of which kinematic distances are estimated as 4.2$\pm 0.7$ and
5.5$\pm 1.5$ kpc, respectively. Both velocity components are probably in the
near Scutum spiral arm. G31.9+0.0 (3C 391): Both OH 1720 MHz maser emission
and different kinds of broadened molecular lines were detected in this SNR at
around +105 km s-1 (Green et al., 1997; Frail et al., 1996; Wilner et al.,
1998; Reach & Rho, 1999; Hewitt et al., 2008; Gusdorf et al., 2014; Kilpatrick
et al., 2016, see Table LABEL:tab:snrpre for more information). Lee et al.
(2020) also detected near-infrared H2 lines at +100 km s-1toward the SNR.
Here, only one broad line component at +104.1 km s-1 is identified in the SNR
by full criteria. As indicated by the SCC, the +104.1 km s-1 component is also
spatially correlated with the remnant. Molecular gas at $\sim$+107.1 km s-1 is
roughly surrounding the remnant. These evidences indicate that the remnant is
associated with the +104.1 km s-1 MC, and the corresponding kinematic distance
is estimated as 7.2$\pm 0.8$ kpc. Note that the result here is consistent with
the H i absorption result in previous work (Ranasinghe & Leahy, 2017).
G32.0-4.9 (3C 396.1): There is no broad line identified in this SNR even by
partial criteria. Molecular gas at the peak of the SCC at $\sim$+0.6 km s-1 is
distributed around the southwestern boundary of the remnant. In addition,
molecular gas at an adjacent peak of the SCC at $\sim$+3.8 km s-1 is roughly
surrounding the northeast of the remnant. If the remnant is associated with
molecular gas at $\sim$+0.6 km s-1, its kinematic distance can be estimated as
0.24$\pm 0.02$ kpc. G32.1-0.9: This SNR is adjacent to SNRC G32.37-0.51 to the
northeast. There is only one component at +91.3 km s-1 with broad lines
identified in the northeast of the remnant. Molecular gas at a peak of the SCC
at $\sim$+100.8 km s-1 is distributed around the northeastern boundary of the
remnant, which belongs to the +91.3 km s-1 component. The remnant is probably
associated with the +91.3 km s-1 component with the corresponding kinematic
distance estimated as 5.0$\pm 0.9$ kpc. G32.4+0.1: Broad 12CO(J=2–1) lines at
+43 km s-1 were detected toward this SNR by Kilpatrick et al. (2016) (see
Table LABEL:tab:snrpre for more information). Here, only one component at
+42.0 km s-1 is with broad lines identified in the SNR. Broad line points are
located in the southeastern overlapping H ii regions and around the
northeastern boundary of the remnant. Molecular gas at a peak of the SCC at
$\sim$+48.3 km s-1 is surrounding the north and west of the remnant, which
belongs to the +42.0 km s-1 broad line component. Therefore, we suggest that
the remnant is associated with the +42.0 km s-1 MC. The corresponding
kinematic distance is estimated as 10.1$\pm 0.4$ kpc. G32.8-0.1 (Kes 78): This
SNR presents shell-like radio continuum emission in the southeast (Caswell et
al., 1975a). The north of the SNR overlaps with the small SNRC G32.73+0.15. OH
1720 MHz maser emission at +86.1 km s-1, broad CO lines at +81 km s-1, and
near-infrared H2 lines at +90 km s-1 were detected in the SNR (Koralesky et
al., 1998; Zhou & Chen, 2011; Lee et al., 2020, see Table LABEL:tab:snrpre for
more information). Here, multiple broad line components are identified in the
SNR by full criteria. Some broad lines are probably originated from overlapped
H ii regions. As indicated by the SCC, the +64.1 km s-1 broad line component
shows some spatial correlations with the remnant, of which a part of a long
molecular filament is roughly surrounding its southeast. The SCC peaks at
$\sim$+92.7 km s-1, where molecular gas is mainly distributed in the remnant.
There is also a molecular filament at $\sim$+91.4 km s-1 surrounding the south
of the remnant but at a distance. These molecular gases belong to the +94.5 km
s-1 broad line component. Broad line points of two components, i.e. at +64.1
and +94.5 km s-1, are outside the overlapping region with SNRC G32.73+0.15.
Nevertheless, only the +94.5 km s-1 component is with broad lines identified
in the SNR by full criteria plus the clean subbackground region condition. The
highest velocity of H i absorption features is $\sim$+90 km s-1 (e.g., Zhou &
Chen, 2011), indicating that the remnant is in front of the tangent point and
behind the MC at $\sim$+90 km s-1. It favors the +94.5 km s-1 MC being
associated with the remnant. Based on these evidences, we suggest that the
remnant is associated with the +94.5 km s-1 component, of which the kinematic
distance is estimated as 5.1$\pm 0.5$ kpc. The near kinematic distance
obtained is consistent with the H i absorption result in previous works
(Ranasinghe & Leahy, 2018b, and references therein). G33.2-0.6: No broad line
is identified in this SNR by full criteria. Only one component at +78.9 km s-1
is with broad line candidates identified in the remnant by partial criteria.
Molecular gas of the +78.9 km s-1 component is distributed around the northern
radio continuum shell of the remnant. The remnant is probably associated with
the +78.9 km s-1 component, of which the kinematic distance is estimated as
4.7$\pm 0.8$ kpc. G33.6+0.1 (Kes 79): Broad CO lines at $\sim$+105 km s-1 were
detected toward this SNR (Kilpatrick et al., 2016; Zhou et al., 2016a, see
Table LABEL:tab:snrpre for more information). Here, several broad line
components are identified in the SNR by full criteria. No significant spatial
correlation result is found through the SCC. Some molecular gas of the +71.6
km s-1 broad line component is surrounding the western radio continuum shell
of the remnant; however, there is also some molecular gas inside the remnant.
There is molecular gas of the +105.3 km s-1 component distributed around the
radio continuum shell of the remnant in the southeast, especially, matching a
radio continuum protrusion. Some broad line points at +105.3 km s-1 are also
distributed on the top and in the wings of the radio continuum protrusion. No
good spatial correlation result is found for other broad line components. The
remnant is probably associated with the +105.3 km s-1 component, or may be
associated with the +71.6 km s-1 component. Kinematic distances are estimated
as 5.1$\pm 0.6$ kpc for the +71.6 km s-1 component and 6.7$\pm 0.6$ kpc for
the +105.3 km s-1 component. G34.7-0.4 (W44): The association between this SNR
and MCs was confirmed by multiband observations of shocked molecular gases,
e.g., OH masers, CH3OH masers, CO lines, HCO+ lines, near-infrared H2 lines ,
etc. (Caswell et al., 1975b; Wootten, 1977; Green et al., 1997; Claussen et
al., 1997; Seta et al., 2004; Hewitt et al., 2008; McDonnell et al., 2008;
Sashida et al., 2013; Yoshiike et al., 2013; Anderl et al., 2014; McEwen,
2016; Yamada et al., 2017; Lee et al., 2020, see Table LABEL:tab:snrpre for
more information). As a well-established case of SNR-MC association, the
interaction details were further studied as well, which also explains the
hadronic $\gamma$-ray production in the remnant (Yoshiike et al., 2013). Note
that a small part of the SNR in the northeast overlaps with SNRC G34.93-0.24.
Here, broad lines at several velocities are identified in the remnant even by
full criteria plus the clean subbackground region condition. Broad lines at
+42.7 and +46.8 km s-1 can be attributed to the nearby prominent component at
+46.0 km s-1. Most of the broad line points at +46.0 km s-1 are distributed
around the southeastern radio continuum shell of the remnant. Molecular gas at
the peak of the SCC at $\sim$+48.9 km s-1 is also roughly surrounding the
southeastern radio shell, which belongs to the +46.0 km s-1broad line
component. We find no good spatial correlation between the remnant and other
broad line components. Note that a large portion of broad lines at +81.9 km
s-1 is probably originated from an overlapped H ii region in the northwest.
Based on the kinematic evidence and the spatial correlation result, we suggest
that the remnant is associated with the +46.0 km s-1 MC with the kinematic
distance estimated as 2.5$\pm 0.2$ kpc. The near kinematic distance obtained
here is consistent with the H i absorption result in previous works
(Ranasinghe & Leahy, 2018b, and references therein). G35.6-0.4: We identified
several broad line components in this SNR by full criteria. As indicated by
the SCC, molecular gas at $\sim$+11.9 km s-1 is spatially correlated with the
radio continuum emission of the remnant well; however, no corresponding broad
line is identified in the remnant even by partial criteria. Molecular gases at
minor peaks of the SCC at $\sim$+26.0 and $\sim$+37.5 km s-1, which probably
belong to the +27.4 km s-1 broad line component, are roughly surrounding the
northwest and east of the remnant, respectively. Molecular gas of the +54.6 km
s-1 component is distributed around the northern boundary of the remnant. In
addition, broad line points of the +54.6 km s-1 component are distributed
around the radio continuum emission of the remnant. No spatial correlation is
found for other broad line components. The remnant may be associated with
either the +27.4 or +54.6 km s-1 components. H i absorption results in
previous works favor the SNR at a near kinematic distance (Zhu et al., 2013;
Ranasinghe & Leahy, 2018b). The kinematic distance is estimated as 2.1$\pm
0.2$ kpc for the +27.4 km s-1 component. The near kinematic distance of the
+54.6 km s-1 component is estimated as 2.9$\pm 0.4$ kpc. G36.6-0.7: The
northeast of this SNR overlaps with SNRC G36.66-0.50, and there is an H ii
region at +54.1 km s-1 located in the overlapping region. There are two broad
line components identified in the remnant by full criteria, i.e. at +56.6 and
+78.7 km s-1. Broad line points at +56.6 km s-1 are located in the overlapping
region with the SNRC and the H ii region. As indicated by the SCC, molecular
gas at $\sim$+54.4 km s-1 belonging to the +56.6 km s-1 component is
distributed around the northeastern half of the remnant. One broad line point
is at +78.7 km s-1, which is outside the overlapping region with the SNRC and
the H ii region. Molecular gas of the +78.7 km s-1 component is distributed
around the northeastern boundary of the remnant. The remnant may be associated
with either the +56.6 or +78.7 km s-1 components. Kinematic distances are
estimated as 3.0$\pm 0.5$ kpc for the +56.6 km s-1 component and 4.2$\pm 0.5$
kpc for the +78.7 km s-1 component. G36.6+2.6: This SNR presents radio
continuum shells in the northwest and south. No broad line is identified in
this SNR even by partial criteria. The SCC peaks at $\sim$+19.5 km s-1, where
molecular gas is distributed around the southern and western boundaries of the
remnant. If the remnant is associated with molecular gas at $\sim$+19.5 km
s-1, its kinematic distance can be estimated as 0.5$\pm 0.4$ kpc. G38.7-1.3:
The northeast of this SNR overlaps with SNRC G38.72-0.87. Only one broad line
component at +75.1 km s-1 is identified in the remnant by full criteria. Note
that many broad line points are in the overlapping region with the SNRC. The
SCC also supports the association between the remnant and the +75.1 km s-1
component, of which molecular gas is roughly surrounding the northeastern
radio continuum shell. We suggest that the remnant is associated with the
+75.1 km s-1 component, and the corresponding kinematic distance is estimated
as 4.2$\pm 0.6$ kpc. G39.2-0.3 (3C 396): Broad CO lines at +69, +77, and +84
km s-1 and near-infrared H2 lines at +56 km s-1 were detected toward this SNR
in previous works (Su et al., 2011; Kilpatrick et al., 2016; Lee et al., 2020,
see Table LABEL:tab:snrpre for more information). Here, two broad lines at
+44.1 and +61.4 km s-1 are identified in this SNR by full criteria. The SCC
peaks at $\sim$+56.4 km s-1, where molecular gas is roughly surrounding the
remnant. It supports the association between the remnant and the +61.4 km s-1
component. No spatial correlation is found between the remnant and the +44.1
km s-1 component. Molecular gas at a minor peak of the SCC at $\sim$+12.7 km
s-1 is roughly surrounding the remnant except for its southwest side, but no
corresponding broad line is identified in the remnant even by partial
criteria. At another minor peak of the SCC at $\sim$+86.2 km s-1, molecular
gas is also roughly surrounding the whole remnant except for its southwest
side. It belongs to the +84.2 km s-1 component with broad line candidates
identified in the remnant by partial criteria. The remnant may be associated
with either the +61.4 or +84.2 km s-1 components. Su et al. (2011), Ranasinghe
& Leahy (2018b) showed H i absorption up to the tangent point velocity,
indicating that the SNR is at a far kinematic distance. The kinematic distance
of the +61.4 km s-1 component is estimated as 8.7$\pm 0.5$ kpc, and the far
kinematic distance of the +84.2 km s-1 component is estimated as 7.4$\pm 0.9$
kpc. G39.7-2.0 (W50): The radio continuum emission of this SNR is bipolar
spindle shape, hosting the X-ray binary system SS 433 with relativistic jets
precessing around the major axis of W50 (e.g., Downes et al., 1986; Brinkmann
et al., 1996; Dubner et al., 1998; Gao et al., 2011). Broad CO lines at +77
and +53 km s-1 were detected toward this SNR by Su et al. (2018), Liu et al.
(2020), respectively (see Table LABEL:tab:snrpre for more information).
However, broad CO lines at +77 km s-1 are outside the SNR region we examined,
probably due to jet-ISM interactions (Su et al., 2018), and the width of
asymmetric broad CO lines at +53 km s-1 is $\lesssim$6 km s-1 (Liu et al.,
2020). Here, we identify no broad line in the SNR by full criteria. We also
find no good spatial correlation between the remnant and molecular gas at
different velocities. G40.5-0.5: We identify several broad line components in
this SNR by full criteria. Only one broad line is at +65.3 km s-1, which can
be attributed to the nearby component at +67.7 km s-1. As indicated by the
SCC, only the +67.7 km s-1 broad line component is spatially correlated with
the remnant. Molecular gas at the peak of the SCC at $\sim$+53.0 km s-1 is
roughly surrounding the northeastern half of the remnant, where radio
continuum emission is bright. Based on these evidences, we suggest that the
remnant is associated with the +65.3 km s-1 component. The corresponding
kinematic distance is estimated as 8.4$\pm 0.4$ kpc. G41.1-0.3 (3C 397): Broad
CO lines at $\sim$+32 km s-1 were detected toward this SNR (Jiang et al.,
2010; Kilpatrick et al., 2016, see Table LABEL:tab:snrpre for more
information). Here, two broad line components at +35.7 and +60.4 km s-1 are
identified in the SNR by full criteria. Broad lines at +60.4 km s-1 may be
originated from an overlapped H ii region. The SCC peaks at $\sim$+43.0 km
s-1, where molecular gas is roughly surrounding the remnant. It belongs to the
+35.7 km s-1 component. Both the kinematic evidence and the spatial
correlation result indicate that the remnant is associated with the +35.7 km
s-1 component. As shown by Leahy & Ranasinghe (2016), the presence of H i
absorption up to the tangent point velocity indicates that the SNR is at a far
kinematic distance. The far kinematic distance of the +35.7 km s-1 component
is estimated as 8.8$\pm 1.7$ kpc. G41.5+0.4: Sofue et al. (2021) found a
spatial correlation between this SNR and molecular gas at +58 km s-1. Here,
there are two broad line components at +41.0 and +57.1 km s-1 identified in
the SNR by full criteria. As indicated by the SCC, molecular gas at
$\sim$+35.4 km s-1 is roughly surrounding the remnant, which belongs to the
+41.0 km s-1 component. No good spatial correlation result is found for the
+57.1 km s-1 component. Therefore, we suggest that the remnant is associated
with the +41.0 km s-1 component, of which the kinematic distance is estimated
as 2.6$\pm 0.5$ kpc. The near kinematic distance obtained here is consistent
with the H i absorption result in previous work (Ranasinghe et al., 2018).
G42.0-0.1: The south of this SNR overlaps with SNRC G41.95-0.18. Three broad
line components are identified in the remnant by full criteria, i.e. at +19.8,
+56.6, and +65.6 km s-1. There are also many broad lines at +56.6 km s-1
identified outside the remnant, which are unrelated to the remnant. We also
find no good spatial correlation between the remnant and the +56.6 km s-1
component. Broad line points at +19.8 km s-1 are located in the overlapping
region with an H ii region in the northwest. However, there are also many
broad line candidates at +19.8 km s-1 identified in the remnant but outside
the overlapping region with the H ii region by partial criteria. Molecular gas
at a minor peak of the SCC at $\sim$+16.2 km s-1 is surrounding the east of
the remnant and distributed in the northwest of the remnant, which belongs to
the +19.8 km s-1 component. There is only one broad line at +65.6 km s-1,
which locates in the overlapping region with SNRC G41.95-0.18. Three molecular
clumps at the nonsignificant peak of the SCC at $\sim$+73.3 km s-1 are
distributed around the remnant, which belongs to the +65.6 km s-1 component.
The remnant may be associated with either the +19.8 or +65.6 km s-1
components. Kinematic distances are estimated as 11.0$\pm 0.4$ kpc for the
+19.8 km s-1 component and as 7.9$\pm 0.5$ kpc for the +65.6 km s-1 component.
G42.8+0.6: A small part of this SNR in the east overlaps with SNRC
G43.02+0.73. No broad line is identified in this SNR by full criteria. Broad
line candidates at two velocities are identified in the remnant by partial
criteria. There is only one broad line candidate at +25.6 km s-1, which can be
attributed to the nearby +23.7 km s-1 component. Most of the broad line
candidate points are outside the overlapping region with SNRC G43.02+0.73.
Molecular gases at minor peaks of the SCC at $\sim$+26.5 and $\sim$+33.3 km
s-1 are roughly surrounding the northwest and southeast of the remnant,
respectively, which belong to the +23.7 km s-1 component. The remnant may be
associated with the +23.7 km s-1 component, and the corresponding kinematic
distance is estimated as 10.8$\pm 0.3$ kpc. G43.3-0.2 (W49B): More or less
spatial correlations were found for all three major velocity components in the
direction of this SNR, i.e. at about +10, +45, and +60 km s-1 (Chen et al.,
2014; Zhu et al., 2014; Sano et al., 2021; Sofue et al., 2021). Broad
12CO(J=2–1) lines at +14 km s-1 were detected toward the SNR by Kilpatrick et
al. (2016), and warm molecular gases at $\sim$+10 km s-1 and the expanding gas
motion at $\sim$+10 and $\sim$+40 km s-1 were detected by Sano et al. (2021).
Nevertheless, Zhou et al. (2022) detected very broad HCO+ lines in the SNR,
providing strong evidence for the association between the remnant and the
$\sim$+63 km s-1 velocity component. Lee et al. (2020) also detected near-
infrared H2 lines at +64 km s-1 toward the remnant. The SNR was also studied
by other spectral lines supporting one or the other of the three components
(see Table LABEL:tab:snrpre for more information). Here, two broad line
components at +39.8 and +60.1 km s-1 are identified in the SNR by full
criteria. There is only one broad line identified for the +39.8 km s-1
component, which locates in the northwestern radio bright region of the
remnant. Some broad lines of the +60.1 km s-1 component are in an overlapped H
ii region in the southeast. The SCC has two significant peaks at $\sim$+15.6
and $\sim$+43.3 km s-1. Molecular gas at $\sim$+43.3 km s-1 that belongs to
the +39.8 km s-1 component is surrounding the whole remnant except for its
northwest side. A minor peak at $\sim$+56.5 km s-1 also indicates a roughly
spatial correlation between the remnant the +60.1 km s-1 component, where
molecular gas is distributed around the remnant’s boundary. Based on these
evidences, either the +39.8 or +60.1 km s-1 components may be associated with
the remnant. As shown by Ranasinghe & Leahy (2018b), the presence of H i
absorption up to the tangent point velocity indicates that the SNR is at a far
kinematic distance. The far kinematic distance of the +39.8 km s-1 component
is estimated as 9.3$\pm 0.8$ kpc, and the kinematic distance of the +60.1 km
s-1 component is estimated as 7.7$\pm 0.6$ kpc. G43.9+1.6: Broad CO lines at
+50 km s-1 were detected toward this SNR by Zhou et al. (2020b). Here, no
broad line is identified in the SNR by full criteria. One broad line candidate
at +47.9 km s-1 is identified in the SNR by partial criteria. As indicated by
the SCC, there are several molecular clumps belonging to the +47.9 km s-1
component distributed around the eastern half of the remnant. These evidences
indicate that the remnant may be associated with the +47.9 km s-1 component.
This association is consistent with the result in previous work (see Table
LABEL:tab:snrpre). Corresponding near and far kinematic distances are
estimated as 2.8$\pm 0.6$ and 8.9$\pm 0.6$ kpc, respectively. G45.7-0.4: This
SNR is adjacent to SNRC G45.35-0.37 to the west. Broad lines at several
velocities are identified in the remnant by full criteria, nevertheless, only
the +59.6 km s-1 component is with more than one broad line identified.
Besides, we also find spatial correlation between the remnant and the +59.6 km
s-1 component. Molecular gas at the peak of the SCC at $\sim$+71.4 km s-1 is
surrounding the southeast and northwest of the remnant, where partial radio
continuum shells are present. No good spatial correlation is found for other
velocity components. These evidences indicate that the remnant is associated
with the +59.6 km s-1 MC with the kinematic distance estimated as 7.0$\pm 0.6$
kpc. G46.8-0.3 (HC30): Three broad line components are identified in this SNR
by full criteria. Two of them at +19.4 and +59.3 km s-1 are found to be
spatially associated with the remnant, as indicated by the SCC. For the +19.4
km s-1 component, molecular gas at $\sim$+21.4 km s-1 is roughly surrounding
the north of the remnant. For the +59.3 km s-1 component, molecular gas at
$\sim$+56.4 km s-1 presents as a cavity-like structure enclosing the remnant.
Therefore, the remnant may be associated with either the +19.4 or +59.3 km s-1
components. Note that there is H i absorption at the tangent point velocity
toward this SNR detected by Sato (1979), Ranasinghe & Leahy (2018b), and Supan
et al. (2022), indicating that the SNR is at a far kinematic distance. The far
kinematic distance of the +19.4 km s-1 component is estimated as 10.1$\pm 0.6$
kpc, and the kinematic distance of the +59.3 km s-1 component is estimated as
6.9$\pm 0.5$ kpc. G49.2-0.7 (W51C): Both OH 1720 MHz maser emission with
velocities from +68.9 to +72.13 km s-1 and broad 12CO(J=2–1) lines at +60 km
s-1 were detected in this SNR (Green et al., 1997; Koo & Moon, 1997; Brogan et
al., 2000; Hewitt et al., 2008, see Table LABEL:tab:snrpre for more
information). Here, broad lines at three velocities are identified in the SNR
by full criteria. All of these broad lines are probably originated from the
same component at +61.1 km s-1. Note that part of broad lines may be
associated with overlapped H ii regions. As indicated by the SCC, the +61.1 km
s-1 component is spatially correlated with the remnant, and most of its gas is
surrounding the north of the remnant. As indicated by the kinematic evidence
and the spatial correlation result, the remnant is associated with the +61.1
km s-1 MC with the corresponding kinematic distance estimated as 5.5$\pm 0.3$
kpc. This is consistent with multiband results in previous works (see Table
LABEL:tab:snrpre). G53.6-2.2 (3C 400.2): We identify no broad line and find no
good spatial correlation result for this SNR. The SCC peaks at $\sim$+18.3 km
s-1, where a molecular clump is located around the eastern boundary of the
remnant. It may support the spatial correlation between the remnant and H i
gas revealed in previous work (see Table LABEL:tab:snrpre). G54.1+0.3: Toward
this SNR, broad 12CO(J=2–1) lines were detected at +23 km s-1 with widths
(FWHM) $\lesssim$7 km s-1 (Lee et al., 2012b, see Table LABEL:tab:snrpre for
more information). Here, no broad line is identified in the SNR even by
partial criteria. The SCC peaks at $\sim$+51.3 km s-1, where molecular gas is
roughly surrounding the northwest of the remnant and also distributed around
the southeastern boundary. If the remnant is associated with molecular gas at
$\sim$+51.3 km s-1, its kinematic distance can be estimated as 4.4$\pm 0.6$
kpc. G54.4-0.3 (HC40): This SNR presents a bright radio continuum shell in the
north. The northwest of this SNR is adjacent to two H ii regions at about +38
and +42 km s-1. Broad lines associated with these H ii regions are identified,
which are outside the remnant. Broad lines at velocities of +35.5, +40.2, and
+51.5 km s-1 in the remnant are identified by full criteria. Two broad lines
at +40.2 km s-1 component can be attributed to the nearby +35.5 km s-1
component. At the minor peak of the SCC at $\sim$+39.8 km s-1, molecular gas
is distributed around the northern boundary of the remnant but not well
correlated, which belongs to the +35.5 km s-1 component. We find no good
spatial correlation between the remnant and the +51.5 km s-1 component.
Therefore, we suggest that the remnant and the +35.5 km s-1 component are
associated. Considering that H i absorption is present up to the tangent point
velocity shown by Ranasinghe & Leahy (2017), the kinematic distance of the
+35.5 km s-1 component is estimated as 5.1$\pm 0.3$ kpc. G55.0+0.3: The south
of this SNR is adjacent to an H ii region at about +31 km s-1. Two broad line
components at +10.5 and +28.4 km s-1 are identified in the remnant. No good
spatial correlation is found between the remnant and the +10.5 km s-1
component. Molecular gas at the peak of the SCC at $\sim$+38.9 km s-1 is
roughly surrounding the east and south of the remnant, which belongs to the
+28.4 km s-1 broad line component. Therefore, we suggest that the remnant is
associated with the +28.4 km s-1 component with the kinematic distance
estimated as 4.3$\pm 0.7$ kpc. G55.7+3.4: This SNR presents shell-like radio
continuum emission around its southwestern half. No broad line is identified
in this SNR even by partial criteria. Molecular gas at the peak of the SCC at
$\sim$+6.8 km s-1 is roughly surrounding the south of the remnant. The remnant
may be associated with molecular gas at $\sim$+6.8 km s-1, of which the near
and far kinematic distances are estimated as 0.1$\pm 0.6$ and 9.0$\pm 0.6$
kpc, respectively. If the remnant locates at the far distance of 9.0 kpc, its
height from the Galactic plane would be as high as $\sim$540 pc. G57.2+0.8
(4C-21.53): No broad line is identified in this SNR even by partial criteria.
As indicated by the SCC, molecular gases at $\sim$+13.0 and $\sim$+30.0 km s-1
show some spatial correlations with the remnant. Molecular gas at $\sim$+13.0
km s-1 is roughly surrounding the south of the remnant. Molecular gas at
$\sim$+30.0 km s-1 presents as a short filament connected to a shell-like
structure located in the south of the remnant. The remnant may be associated
with molecular gases at $\sim$+13.0 or $\sim$+30.0 km s-1. The presence of H i
absorption up to the tangent point velocity shown by Ranasinghe et al. (2018)
indicates that the SNR is at the far side of the tangent point. For molecular
gas at $\sim$+13.0 km s-1, the kinematic distance is estimated as 8.3$\pm 0.7$
kpc. For molecular gas at $\sim$+30.0 km s-1, the far kinematic distance is
estimated as 6.3$\pm 1.4$ kpc. G59.5+0.1: Broad CO lines at +28 km s-1 were
detected toward this SNR by (Xu & Wang, 2012, see Table LABEL:tab:snrpre for
more information). The SNR is close to H ii regions at about $-$3 and +29 km
s-1. Here, three broad line components at +0.7, +21.8, and +28.9 km s-1 are
identified in the SNR by full criteria. There are two broad lines identified
at +28.9 km s-1, which can be attributed to the nearby +21.8 km s-1 component.
Broad line points of the +0.7 km s-1 component are beside the nearby H ii
region at about $-$3 km s-1. Molecular gas at the peak of the SCC at
$\sim$+1.9 km s-1 is distributed around the northern boundary of the remnant,
however, not well correlated. Molecular gas of the +21.8 km s-1 component is
distributed around the eastern half of the remnant, which is also not well
correlated. The remnant may be associated with either the +0.7 or +21.8 km s-1
components. Kinematic distances are estimated as 8.3$\pm 0.4$ kpc for the +0.7
km s-1 component and 2.2$\pm 0.1$ kpc for the +21.8 km s-1 component.
G65.1+0.6: This SNR presents a bright radio continuum shell in the southwest
and some radio continuum emission in the northeast. Broad lines at several
velocities are identified in the SNR by full criteria. Broad lines at $-$3.5
and +11.3 km s-1 are probably originated from nearby components at $-$16.4 and
+16.0 km s-1, respectively. As indicated by the SCC, molecular gas at
$\sim$$-$15.2 km s-1 shows some spatial correlations with the remnant, which
is distributed around the southwestern radio continuum shell of the remnant.
It belongs to the $-$16.4 km s-1 broad line component. Molecular gas at
$\sim$+18.6 km s-1 belonging to the +16.0 km s-1 broad line component is
distributed around the southwestern and northeastern boundaries of the
remnant. The remnant may be associated with either the $-$16.4 or +16.0 km s-1
components. The kinematic distance of the $-$16.4 km s-1 component is
estimated as 7.9$\pm 0.5$ kpc. The near and far kinematic distances of the
+16.0 km s-1 component are estimated as 1.6$\pm 1.1$ and 5.7$\pm 0.9$ kpc,
respectively. G66.0-0.0: No broad line is identified in this SNR by full
criteria; however, broad line candidates at velocities of +1.7, +9.1, and
+15.6 km s-1 are identified in this SNR by partial criteria. Broad lines at
+9.1 km s-1 can be attributed to the nearby prominent component at +15.6 km
s-1. Molecular gases of both the +1.7 and +15.6 km s-1 components are roughly
surrounding the remnant. The remnant may be associated with either of these
two components. Kinematic distances are estimated as 7.1$\pm 0.4$ kpc for the
+1.7 km s-1 component and 4.4$\pm 0.5$ kpc for the +15.6 km s-1 component.
G67.6+0.9: Only one broad line component at $-$21.3 km s-1 is identified in
this SNR by full criteria. However, the $-$21.3 km s-1 component shows no good
spatial correlation with the remnant. At the peak of the SCC at $\sim$+1.7 km
s-1, there are molecular clumps roughly surrounding the remnant, mainly in the
southeast, which belongs to the +9.8 km s-1 component with a broad line
candidate identified in the remnant by partial criteria. The remnant is
probably associated with the +9.8 km s-1 component, or may be associated with
the $-$21.3 km s-1 component. Kinematic distances are estimated as 4.3$\pm
0.7$ kpc for the +9.8 km s-1 component and 7.7$\pm 0.6$ for the $-$21.3 km s-1
component. G67.8+0.5: No broad line is identified in this SNR even by partial
criteria. Molecular gas at the peak of the SCC at $\sim$$-$1.7 km s-1 is
distributed around the northern and western boundaries of the remnant. If the
remnant is associated with molecular gas at $\sim$$-$1.7 km s-1, its kinematic
distance can be estimated as 6.9$\pm 0.5$ kpc. G68.6-1.2: Only one broad line
component at +10.0 km s-1 is identified in this SNR, with broad line points
distributed in the north. As indicated by the SCC, molecular gas at
$\sim$+11.9 km s-1 is roughly surrounding the remnant, which belongs to the
+10.0 km s-1 component. Based on these results, we suggest that the remnant is
associated with the +10.0 km s-1 component with the corresponding kinematic
distance estimated as 4.2$\pm 0.6$ kpc. G69.7+1.0: No broad line is identified
in this SNR even by partial criteria. We also find no good spatial correlation
result. However, there are several peaks of the SCC. Molecular gas at
$\sim$$-$64.3 km s-1 is distributed around the southeastern boundary of the
remnant, and molecular gas at $\sim$$-$48.9 km s-1 is distributed around the
northeastern boundary. There is more molecular gas at $\sim$+13.7 km s-1,
which is widely distributed around the east of the remnant. G73.9+0.9: We only
identify one broad line candidate at +0.3 km s-1 in this SNR by partial
criteria. Molecular gas at a peak of the SCC at $\sim$+6.0 km s-1 is
distributed around the southern boundary of the remnant, which belongs to the
+0.3 km s-1 component. The remnant may be associated with the +0.3 km s-1
component, of which the kinematic distance is estimated as 3.5$\pm 0.6$ kpc.
G78.2+2.1 (DR4): One broad line component at $-$0.8 km s-1 is identified in
this SNR by full criteria. Molecular gas at the peak of the SCC at $\sim$+1.3
km s-1 is roughly surrounding the remnant, which belongs to the $-$0.8 km s-1
component. These evidences indicate that the remnant is associated with the
$-$0.8 km s-1 component. The corresponding kinematic distance is estimated as
2.5$\pm 0.8$ kpc. G82.2+5.3 (W63): A small part of this SNR in the north is
not covered in our observation. No broad line is identified in the SNR even by
partial criteria. Molecular gas at the nonsignificant peak of the SCC at
$\sim$$-$18.7 km s-1 is distributed around the southwestern boundary of the
remnant, where the remnant’s radio continuum emission is bright. If the
remnant is associated with molecular gas at $\sim$$-$18.7 km s-1, its
kinematic distance can be estimated as 5.1$\pm 0.8$ kpc. G83.0-0.3: Only one
broad line candidate at +12.2 km s-1 is identified in this SNR by partial
criteria. No significant spatial correlation result is found through the SCC.
Nevertheless, molecular gas at a peak of the SCC at $\sim$+12.4 km s-1 is
distributed around the northeastern and western boundary of the remnant, which
belongs to the +12.2 km s-1 component. The remnant may be associated with the
+12.2 km s-1 component, and the corresponding kinematic distance is estimated
as 1.9$\pm 0.5$ kpc. G84.2-0.8: Spatial correlations between this SNR and MCs
at $-39$ and $-17$ km s-1 were found (Huang & Thaddeus, 1986; Feldt & Green,
1993; Jeong et al., 2012). Here, no broad line is identified in the SNR even
by partial criteria. The SCC peaks at $\sim$$-$17.5 km s-1 where molecular gas
is mainly distributed in the remnant, not well correlated. Molecular gas at a
peak of the SCC at $\sim$+6.0 km s-1 is roughly cavity-like, surrounding the
remnant. If the remnant is associated with molecular gas at $\sim$+6.0 km s-1,
its kinematic distance can be estimated as 1.4$\pm 0.2$ kpc. G85.4+0.7: Broad
line candidates are identified in this SNR by partial criteria. No broad line
is identified in the SNR by full criteria. As indicated by the SCC, the
remnant is spatially correlated with the $-$41.7 and $-$0.6 km s-1 components.
The $-$41.7 km s-1 component is well surrounding the east and southwest of the
remnant, and the $-$0.6 km s-1 component is roughly surrounding its south and
northwest. The remnant may be associated with the $-$41.7 or $-$0.6 km s-1
components. Kinematic distances are estimated as 5.1$\pm 0.6$ kpc for the
$-$41.7 km s-1 component and 1.7$\pm 0.4$ kpc for the $-$0.6 km s-1 component.
G89.0+4.7 (HB 21): Broad CO lines at $-$5 and +3 km s-1 were detected toward
this SNR (Koo et al., 2001; Byun et al., 2006, see Table LABEL:tab:snrpre for
more information). Here, only one broad line component at $-$16.3 km s-1 is
identified in the remnant by full criteria; however, it shows no good spatial
correlation with the remnant. As indicated by the SCC, molecular gas at
$\sim$$-$8.3 km s-1 is spatially correlated with the remnant, which is
distributed around the remnant. It belongs to the $-$4.9 km s-1 component with
broad lines identified in the remnant by partial criteria. Based on these
evidences, the remnant is probably associated with the $-$4.9 km s-1
component, or may be associated with the $-$16.3 km s-1 component. We estimate
kinematic distances to be 3.7$\pm 0.9$ kpc for the $-$16.3 km s-1 component
and 1.6$\pm 0.2$ kpc for the $-$4.9 km s-1 component. The association with the
$-$4.9 km s-1 component is consistent with multiband results in previous works
(see Table LABEL:tab:snrpre). G93.3+6.9 (DA 530): Part of this SNR in the east
is not covered in our observation. No broad line is identified in the remnant
even by partial criteria. We also find no good spatial correlation result for
this remnant. G93.7-0.2 (CTB 104A): Uyaniker et al. (2002) found a spatial
correlation between this SNR and H i gas at $-$6 km s-1. Here, only one broad
line candidate at +19.4 km s-1 is identified in the SNR by partial criteria.
The SCC peaks at $\sim$+11.3 km s-1, where molecular gas is surrounding the
northwest of the remnant. It belongs to the +19.4 km s-1 component. The
remnant may be associated with the +19.4 km s-1 component. In the direction of
this remnant, the velocity of +19.4 km s-1 is beyond the Galactic rotation
curve; hence, no corresponding kinematic distance is obtained. G94.0+1.0 (3C
434.1): No broad line is identified in this SNR even by partial criteria.
Molecular gas at the peak of the SCC at $\sim$$-$13.3 km s-1 is roughly
surrounding the northwest of the remnant. No good spatial correlation result
is found for molecular gases at other velocities. The spatial correlation
result indicates a possible association between the remnant and molecular gas
at $\sim$$-$13.3 km s-1. The corresponding kinematic distance is estimated as
2.9$\pm 0.8$ kpc. G96.0+2.0: This SNR presents shell-like radio continuum
emission in the southwest. Only one component at $-$18.6 km s-1 is with broad
line candidates identified in the SNR by partial criteria, while no broad line
is identified in it by full criteria. Molecular gas at the peak of the SCC at
$\sim$$-$15.7 km s-1 is distributed around the northwestern boundary but not
correlated well, which belongs to the $-$18.6 km s-1 component. The SNR may be
associated with the $-$18.6 km s-1 component, of which the kinematic distance
is estimated as 3.0$\pm 0.8$ kpc. G106.3+2.7: We identify no broad line in
this SNR even by partial criteria. The SCC peaks at $\sim$$-$6.7 km s-1, where
molecular gas is roughly surrounding the north of the remnant. If the remnant
is associated with molecular gas at $\sim$$-$6.7 km s-1, its kinematic
distance can be estimated as 0.8$\pm 0.1$ kpc. G108.2-0.6: No broad line is
identified in this SNR even by partial criteria. There are many molecular
clumps at the peak of the SCC at $\sim$$-$49.5 km s-1 roughly surrounding the
east of the remnant. The remnant may be associated with molecular gas at
$\sim$$-$49.5 km s-1, of which the kinematic distance is estimated as 2.9$\pm
0.3$ kpc. G109.1-1.0 (CTB 109): An anticorrelation between the CO and X-ray
distributions was found and studied in detail by Tatematsu et al. (1987,
1990a), and an association between this SNR and MCs was suggested (see Table
LABEL:tab:snrpre for more information). Sasaki et al. (2006) detected an
asymmetric CO line profile at $\sim$$-$55 km s-1 but only broadened by
$\lesssim 3$ km s-1. No broad CO emission above 0.4 K was detected by
Tatematsu et al. (1990a). We identify no broad line in the SNR even by partial
criteria. Molecular gas at the peak of the SCC at $\sim$$-$51.1 km s-1 shows
some spatial correlations with the remnant, which is surrounding the west of
it. If the remnant is associated with molecular gas at $\sim$$-$51.1 km s-1,
we can estimate its kinematic distance as 2.8$\pm 0.3$ kpc. G111.7-2.1 (Cas
A): Broad CO lines at $\sim$$-$40 km s-1 were detected toward this SNR
(Kilpatrick et al., 2014, 2016; Ma et al., 2019, see Table LABEL:tab:snrpre
for more information). Nevertheless, no broad CO lines with widths greater
than 7 km s-1 were detected by Zhou et al. (2018). We identify broad line
candidates in only one component at $-$39.0 km s-1 in the SNR by partial
criteria. Molecular gas of the $-$39.0 km s-1 component is mainly distributed
in the east and south of the remnant. If the remnant is associated with the
$-$39.0 km s-1 component, its kinematic distance can be estimated as 3.5$\pm
0.3$ kpc. G120.1+1.4 (Tycho): Broad 12CO(J=1–0) lines ($>$ 5 km s-1) at
$-$63.5 km s-1 were detected toward this SNR by Cai et al. (2009) (see Table
LABEL:tab:snrpre for more information). Here, no broad line is identified in
the SNR even by partial criteria. The SCC peaks at $\sim$$-$63.0 km s-1, where
molecular gas is surrounding the northeast of the remnant and also distributed
around its southwestern boundary. The remnant may be associated with molecular
gas at $\sim$$-$63.0 km s-1, of which near and far kinematic distances are
estimated as 2.7$\pm 0.7$ and 5.5$\pm 0.8$ kpc, respectively. Note that the
absence of H i absorption feature within the velocity range of $-$46 to $-$41
km s-1 favors the near kinematic distance (Tian & Leahy, 2011). G126.2+1.6:
One broad line component at +3.7 km s-1 is identified in this SNR by full
criteria. As indicated by the SCC, molecular gas at $\sim$$-$3.8 km s-1 is
surrounding the northeast and northwest of the remnant, spatially correlated
with the partial radio continuum shell in the northwest. In addition,
molecular gas at $\sim$+6.7 km s-1 is distributed around the southeastern and
western boundary of the remnant. These molecular gases belong to the +3.7 km
s-1 component. The kinematic evidence as well as the spatial correlation
result indicates an association between the remnant and the +3.7 km s-1
component, of which two alternative kinematic distances are estimated as
0.1$\pm 0.2$ and 1.3$\pm 0.1$ kpc. G127.1+0.5 (R5): Broad CO lines at $\sim$+5
km s-1 were detected toward this SNR by Zhou et al. (2014). Here, only one
component at +2.7 km s-1 is with broad line candidates identified in the SNR
by partial criteria. Molecular gas at a peak of the SCC at $\sim$+6.0 km s-1,
as part of a long filament near the remnant, is surrounding the northeast of
the remnant, which belongs to the +2.7 km s-1 component. It is spatially
correlated with the radio continuum shell of the remnant. Based on these
evidences, the remnant is probably associated with the +2.7 km s-1 component,
and the corresponding kinematic distance is estimated as 0.23$\pm 0.02$ kpc.
G132.7+1.3 (HB 3): This SNR is discussed in Section 3.3.2. G150.3+4.5: The
middle and southwest of this SNR overlap with two SNRCs, i.e. G150.8+3.8 and
G149.5+3.2. No broad line is identified in the remnant even by partial
criteria. The SCC indicates a roughly spatial correlation between the remnant
and molecular gas at $\sim$+1.6 km s-1, which distributes around eastern and
southern boundaries of the remnant. If the remnant is associated with
molecular gas at $\sim$+1.6 km s-1, its kinematic distance can be estimated as
0.27$\pm 0.01$ kpc. G152.4-2.1: Only one broad line candidate at $-$16.3 km
s-1 is identified in this SNR by partial criteria. As indicated by minor peaks
of the SCC, molecular gas of the $-$16.3 km s-1 component is distributed
around eastern and northern boundaries of the remnant. However, they are not
spatially correlated very well. If the remnant is associated with the $-$16.3
km s-1 component, its kinematic distance can be estimated as 1.9$\pm 0.4$ kpc.
G160.9+2.6 (HB 9): We identify only one broad line component in this SNR at
$-$21.6 km s-1; however, it shows no good spatial correlation with the
remnant. The SCC peaks at $\sim$$-$2.5 km s-1, where molecular gas is
surrounding the northeast of the remnant. The remnant may be associated with
either the $-$21.6 km s-1 component or molecular gas at $\sim$$-$2.5 km s-1.
Kinematic distances are estimated as 2.1$\pm 0.4$ kpc for the $-$21.6 km s-1
component and 0.5$\pm 0.2$ kpc for molecular gas at $\sim$$-$2.5 km s-1.
G180.0-1.7 (S147): The peak of the SCC for this SNR is not significant, where
molecular gas at $\sim$+6.5 km s-1 is distributed around the remnant. Part of
the molecular gas belongs to the +1.7 km s-1 component that is the only
component with a broad line candidate identified in the remnant by partial
criteria. We identify no broad line in the remnant by full criteria. If the
remnant is associated with the +1.7 km s-1 component, its kinematic distance
can be estimated as 1.59$\pm 0.03$ or 4.3$\pm 0.5$ kpc. G182.4+4.3: Molecular
gas at the peak of the SCC at $\sim$+5.6 km s-1 is surrounding the north and
northwest of this SNR. However, we identify no broad line in the remnant even
by partial criteria. If the remnant is associated with molecular gas at
$\sim$+5.6 km s-1, its kinematic distance can be estimated as 0.23$\pm 0.02$
kpc. G189.1+3.0 (IC 443): This SNR is discussed in Section 3.3.1. G190.9-2.2:
We identify one broad line component at +1.0 km s-1 in this SNR by full
criteria. At the peak of the SCC at $\sim$$-$4.1 km s-1, there is a
filamentary shape MC located in the northern part of the remnant but not
correlated well. Additionally, molecular gas at another peak of the SCC at
$\sim$+5.1 km s-1 is distributed around the southeastern and western
boundaries of the remnant. These molecular gases belong to the +1.0 km s-1
component. Therefore, the remnant is probably associated with the +1.0 km s-1
component, with the corresponding kinematic distance estimated as 1.6$\pm 0.2$
kpc. G205.5+0.5 (Monoceros Loop): Broad CO lines at $\sim$+5 and $\sim$+19 km
s-1 were detected toward this SNR with widths of several kilometers per second
(Su et al., 2017b, see Table LABEL:tab:snrpre for more information). Here, we
identify one broad line component at +21.3 km s-1 in the SNR only by partial
criteria. Broad line points are located near an overlapped H ii region at
+18.1 km s-1 in the south. Molecular gas at the peak of the SCC at $\sim$+13.3
km s-1 is around northern and southern boundaries of the remnant, which
belongs to the +21.3 km s-1 component. The remnant may be associated with the
+21.3 km s-1 component, of which the kinematic distance is estimated as
2.3$\pm 0.4$ kpc. G206.9+2.3 (PKS 0646+06): No broad line is identified in
this SNR. The SCC indicates a spatial correlation between the remnant and
molecular gas at $\sim$+13.7 km s-1, which surrounds the south of the remnant.
If the remnant is associated with molecular gas at $\sim$+13.7 km s-1, its
kinematic distance can be estimated as 2.3$\pm 0.4$ kpc. G213.0-0.6: Broad CO
lines at $\sim$+9 km s-1 were detected toward this SNR with widths of several
kilometers per second (Su et al., 2017b, see Table LABEL:tab:snrpre for more
information). Here, we identify no broad line in the SNR and find no good
spatial correlation result. Molecular gas at the peak of the SCC at
$\sim$+22.9 km s-1 is distributed within the remnant.

##  Appendix B Individual SNR Candidates

G1.95-0.10: The SCC peaks at $\sim$+59.5 km s-1, where molecular gas is
roughly surrounding the west of this SNRC. It belongs to the +44.7 km s-1
component with a broad line candidate identified in the SNRC by full criteria.
These evidences indicate a possible association between the SNRC and the +44.7
km s-1 component. The corresponding kinematic distance is estimated as 8.1$\pm
2.9$ kpc. G1.98-0.46: Molecular gas at the peak of the SCC at $\sim$+8.6 km
s-1 is distributed around this SNRC, which belongs to the +12.6 km s-1
velocity component. Identified broad line candidates in the SNRC also support
the association between the SNRC and the +12.6 km s-1 component. If the SNRC
is associated with the +12.6 km s-1 component, its kinematic distance can be
estimated as 2.8$\pm 0.3$ kpc. G2.23+0.06: This SNRC is classified as the
plerion type, and it is small. We find no good spatial correlation result and
identify no broad line candidate in it by full criteria. G2.28+0.40: Molecular
gas at the peak of the SCC at $\sim$+3.2 km s-1 is roughly surrounding this
SNRC, which belongs to the +4.8 km s-1 velocity component with many broad line
candidates identified in the SNRC’s west by full criteria. The SNRC may be
associated with the +4.8 km s-1 component, of which the kinematic distance is
estimated as 2.8$\pm 0.3$ kpc. G2.91-0.18 and G3.1-0.6: The southeast of SNRC
G2.91-0.18 is adjacent to SNRC G3.1-0.6. For SNRC G2.91-0.18, molecular gas at
a peak of the SCC at $\sim$$-$42.7 km s-1 is surrounding the south and
southwest of the SNRC, where shell-like radio continuum emission is present.
It belongs to the $-$40.0 km s-1 velocity component that is with broad line
candidates identified in the SNRC by full criteria. These evidences indicate
that SNRC G2.91-0.18 is associated with the $-$40.0 km s-1 component, of which
the kinematic distance is estimated as 4.7$\pm 0.3$ kpc. For SNRC G3.1-0.6,
molecular gas at a minor peak of the SCC at $\sim$$-$32.2 km s-1 is roughly
surrounding the north of the SNRC, which belongs to the $-$41.0 km s-1
component with broad line candidates identified in the SNRC by full criteria.
SNRC G3.1-0.6 may be associated with the $-$41.0 km s-1 component with the
corresponding kinematic distance estimated as 4.7$\pm 0.3$ kpc. Therefore,
these two SNRCs may be related to each other. G3.10-0.09: This SNRC overlaps
with SNRC G2.91-0.18. Molecular gases at minor peaks of the SCC at $\sim$+33.3
and $\sim$+92.9 km s-1 are roughly surrounding the shell-like radio continuum
emission of the SNRC in the west. Molecular gas at $\sim$+33.3 km s-1 probably
belongs to the +23.7 km s-1 component, which is with a broad line candidate
identified in the SNRC by full criteria. Molecular gas at $\sim$+92.9 km s-1
belongs to the +95.8 km s-1 component with broad line candidates identified in
the SNRC only by partial criteria. Based on these evidences, either the +23.7
or +95.8 km s-1 components may be associated with the SNRC. Near and far
kinematic distances are estimated as 2.9$\pm 0.3$ and 12.6$\pm 0.3$ kpc for
the +23.7 km s-1 component, respectively. For the +95.8 km s-1 component, the
kinematic distance is estimated as 8.2$\pm 2.9$ kpc. This SNRC is not likely
to be associated with SNRC G2.91-0.18. G3.10+0.11: This SNRC is classified as
the plerion type. No good spatial correlation result is found for the SNRC,
because of its small size. We also identify no broad line candidate in it by
full criteria. G4.20-0.30: Molecular gas at a peak of the SCC at $\sim$$-$27.8
km s-1 is roughly surrounding the northern radio continuum shell of this SNRC,
which belongs to the $-$31.4 km s-1 component with broad line candidates
identified in the SNRC by full criteria. As supported by the spatial
correlation result and identified broad line candidates, the SNRC is probably
associated with the $-$31.4 km s-1 component, of which the kinematic distance
is estimated as 4.7$\pm 0.3$ kpc. G4.49-0.39 and G4.57-0.24: The northeast of
SNRC G4.49-0.39 is adjacent to SNRC G4.57-0.24. For SNRC G4.49-0.39, molecular
gas at a peak of the SCC at $\sim$+16.3 km s-1 shows some spatial correlations
with radio continuum emission of the SNRC, which is roughly surrounding the
east and south of the SNRC. It belongs to the +14.1 km s-1 velocity component
that is with broad line candidates identified in the SNRC by full criteria. If
SNRC G4.49-0.39 and the +14.1 km s-1 component are associated, the kinematic
distance of the SNRC can be estimated as 2.9$\pm 0.2$ kpc. For SNRC
G4.57-0.24, molecular gas at $\sim$+17.0 km s-1 is roughly surrounding its
east and northwest, as indicated by the SCC, which belongs to the +12.3 km s-1
velocity component. There is only one broad line candidate identified in the
SNRC by full criteria, which is at +12.3 km s-1. These evidences indicate that
SNRC G4.57-0.24 is associated with the +12.3 km s-1 component, and the
corresponding kinematic distance is estimated as 2.9$\pm 0.2$ kpc. These two
SNRCs may be related to each other. G5.11+0.33: This SNRC presents a radio
continuum shell in the west. Molecular gas at the peak of the SCC at
$\sim$$-$28.6 km s-1 is roughly surrounding the north and southeast of the
SNRC; however, it is with no broad line candidate identified in the SNRC even
by partial criteria. The distribution of molecular gas at $\sim$+11.7 km s-1
roughly follows the western radio continuum shell. It belongs to the only
velocity component with broad line candidates identified in the SNRC by full
criteria, which is at +13.8 km s-1. Note that part of broad line candidates
may be originated from an overlapped H ii region at +12.0 km s-1. The SNRC is
probably associated with the +13.8 km s-1 component with the kinematic
distance estimated as 2.9$\pm 0.2$ kpc. Accordingly, the SNRC may be related
to the overlapped H ii region. G5.16-0.32: Molecular gas at the peak of the
SCC at $\sim$+5.4 km s-1 is distributed around this SNRC but not correlated
well, which belongs to the +7.6 km s-1 component with a broad line candidate
identified in the SNRC by full criteria. Moreover, molecular gas at a minor
peak of the SCC at $\sim$+59.5 km s-1 shows good spatial correlation with the
SNRC, which is surrounding its southern half. It belongs to the +58.9 km s-1
component that is with broad line candidates identified only by partial
criteria. Based on these evidences, either the +7.6 or +58.9 km s-1 components
may be associated with the SNRC. Corresponding kinematic distances are
estimated as 2.9$\pm 0.2$ and 10.9$\pm 0.3$ kpc for the +7.6 and +58.9 km s-1
components, respectively. G5.36-0.71: Molecular gas at a peak of the SCC at
$\sim$+21.0 km s-1 is roughly surrounding this SNRC. It belongs to the +13.0
km s-1 component that is with broad line candidates identified in the SNRC by
full criteria. The SNRC is probably associated with the +13.0 km s-1
component, and the corresponding kinematic distance is estimated as 2.9$\pm
0.2$ kpc. G5.38-0.28: This SNRC is classified as the plerion type. Since the
SNRC is small, no good spatial correlation result is found. No broad line
candidate is identified in it by full criteria too. G5.38+0.35: The east of
this SNRC overlaps with SNR G5.5+0.3, and it presents a partial radio
continuum shell in the northwest. As indicated by minor peaks of the SCC, the
+8.5 km s-1 component shows a coarse spatial correlation with the SNRC, of
which a portion of molecular gas is distributed around the SNRC’s radio
continuum shell. The +8.5 km s-1 component is the only component with broad
line candidates identified in the SNRC by full criteria. If the SNRC is
associated with the +8.5 km s-1 component, its kinematic distance can be
estimated as 2.9$\pm 0.2$ kpc. G5.7-0.1 (also known as G5.67-0.12): We
consider SNRC G5.7-0.1 and SNRC G005.673-0.118 (see Dokara et al., 2021) as
one SNRC. For this SNRC, we find no prominent spatial correlation result. Two
components at velocities of $-26.1$ and +8.3 km s-1 are with broad line
candidates identified in the SNRC by full criteria. Molecular gases at minor
peaks of the SCC belonging to these two components are roughly surrounding the
southwest and northeast of the SNRC, respectively. We cannot determine which
of the velocity components at $-26.1$ or +8.3 km s-1 is associated with the
SNRC. In previous works, OH 1720 MHz maser and broad CO emission were detected
at $\sim$+12 km s-1, and the CH3OH 36 and 44 GHz masers were detected at
$\sim$$-$25 km s-1 (see Table LABEL:tab:snrpre). We estimate the kinematic
distance of the $-26.1$ km s-1 component to be 4.7$\pm 0.3$ kpc, and the near
and far kinematic distances of the +8.3 km s-1 component to be 2.9$\pm 0.2$
and 12.6$\pm 0.3$ kpc, respectively. G5.76+0.52: Molecular gas at a peak of
the SCC at $\sim$+11.7 km s-1 is roughly surrounding this SNRC. It belongs to
the +6.6 km s-1 velocity component with broad line candidates identified in
the SNRC. The SNRC may be associated with the +6.6 km s-1 component with the
kinematic distance estimated as 2.9$\pm 0.2$ kpc. G5.99+0.02: The east of this
SNRC is adjacent to SNR W28. As indicated by minor peaks of the SCC, the
spatial distribution of the +8.0 km s-1 velocity component is roughly
correlated with the SNRC, which is distributed around the SNRC. It is also
with broad line candidates identified in the SNRC. If the SNRC is associated
with the +8.0 km s-1 component, its near and far kinematic distances can be
estimated as 3.0$\pm 0.2$ and 13.4$\pm 0.3$ kpc, respectively. G6.06+0.50,
G6.12+0.39 and G6.31+0.54: All of these three SNRCs overlap with SNR G6.1+0.5.
For SNRC G6.06+0.50, molecular gas at the peak of the SCC at $\sim$+8.7 km s-1
is roughly surrounding it, which belongs to the +6.8 km s-1 velocity component
with broad line candidates identified in it. These evidences indicate that
SNRC G6.06+0.50 is associated with the +6.8 km s-1 component with the
corresponding kinematic distance estimated as 3.0$\pm 0.2$ kpc. This SNRC
seems to be at the same distance as SNR G6.1+0.5. For SNRC G6.12+0.39, the SCC
indicates a spatial correlation with molecular gas at $\sim$+10.8 km s-1,
which is surrounding the whole SNRC except for its west side. Its spatial
distribution is consistent with that of the +21.8 km s-1 component that is
with a broad line candidate identified in the SNRC. The +7.0 km s-1 component
is also with broad line candidates identified in the SNRC, which are probably
originated from SNR G6.1+0.5 or SNRC G6.06+0.50. Therefore, we suggest that
SNRC G6.12+0.39 is associated with the +21.8 km s-1 MC and locates at a
kinematic distance of 3.6$\pm 0.3$ kpc. SNRC G6.31+0.54 presents a flat radio
continuum shell in the northeast. For SNRC G6.31+0.54, we find no good spatial
correlation result and identify no broad line candidate in it by full
criteria, hence, no associated MC settled. G6.45-0.56 and G6.54-0.60: These
two SNRCs overlap with the south and southwest of SNR G6.5-0.4, respectively.
We find no good spatial correlation result and identify no broad line
candidate in these two SNRCs by full criteria. G7.4+0.3: Molecular gas at a
peak of the SCC at $\sim$+13.7 km s-1 is roughly surrounding this SNRC. It
belongs to the +16.4 km s-1 velocity component, which is with broad line
candidates identified in the SNRC by full criteria. The SNRC may be associated
with the +16.4 km s-1 component, of which the kinematic distance is estimated
as 3.6$\pm 0.4$ kpc. G7.5-1.7: This SNRC exhibits shell-like radio continuum
emission in the north. We find that velocity components at +10.5 and +136.2 km
s-1 show some spatial correlations with the SNRC, of which broad line
candidates are also identified in the SNRC. For the +10.5 km s-1 component,
there are shell-like molecular filaments roughly surrounding the southwest and
north of the SNRC. Molecular gas of the +136.2 km s-1 component is distributed
around the northern radio continuum shell of the SNRC, correlated not so well.
Based on these evidences, the SNRC is probably associated with the +10.5 km
s-1 component, or may be associated with the +136.2 km s-1 component.
Kinematic distances of the +10.5 and +136.2 km s-1 components are estimated as
1.5$\pm 0.1$ and 8.1$\pm 1.9$ kpc, respectively. G8.04+0.57: Molecular gas at
the peak of the SCC at $\sim$+20.3 km s-1 distributes around the southeast of
this SNRC, where its radio continuum emission is bright. It supports the
association between the SNRC and the +12.3 km s-1 component that is the only
component with broad line candidates identified in the SNRC by full criteria.
If the SNRC is associated with the +12.3 km s-1 component, its kinematic
distance can be estimated as 1.6$\pm 0.1$ kpc. G8.86-0.26: The south side of
this SNRC is adjacent to an H ii region at +31.0 km s-1, and it also overlaps
with large SNR W30. The SCC peaks at $\sim$+20.0 km s-1, where molecular gas
is distributed around the SNRC. It belongs to the +18.4 km s-1 component,
which is with broad line candidates identified by full criteria. If the SNRC
is associated with the +18.4 km s-1 component, its kinematic distance can be
estimated as 3.7$\pm 0.3$ kpc. G11.55+0.33: Broad lines at three velocities,
i.e. $-$3.0, +11.8, and +29.9 km s-1, are identified in this SNRC. As
indicated by the SCC, molecular gas at $\sim$+18.6 km s-1 belonging to the
+11.8 km s-1 broad line component shows some spatial correlations with the
SNRC, which is roughly surrounding the southwest of it and also distributed
around its northern boundary. There is also molecular gas at $\sim$+31.9 km
s-1 distributed around the western half of the SNRC, which belongs to the
+29.9 km s-1 broad line component. No good spatial correlation is found
between the SNRC and the $-$3.0 km s-1 component. Based on these evidences,
the SNRC is probably associated with the +11.8 km s-1 component, or may be
associated with the +29.9 km s-1 component. Kinematic distances are estimated
as 1.25$\pm 0.05$ kpc for the +11.8 km s-1 component and 2.9$\pm 0.3$ kpc for
the +29.9 km s-1 component. G13.10-0.50: The southeast of this SNRC overlaps
with SNR G13.3-1.3. There are several broad line components identified in the
SNRC. Nevertheless, there is only one broad line at both +53.5 and +56.5 km
s-1, which are probably originated from the nearby +50.6 km s-1 component.
Molecular gas at a peak of the SCC at $\sim$+53.3 km s-1 is surrounding the
bright radio continuum shell of the SNRC in the north, which belongs to the
+50.6 km s-1 broad line component. Both the kinematic evidence and the spatial
correlation result indicate that the SNRC is associated with the +50.6 km s-1
component. The corresponding kinematic distance is estimated as 3.9$\pm 0.3$
kpc. At the peak of the SCC at $\sim$+18.4 km s-1, there are molecular clumps
distributed around the eastern and southern boundaries of the SNRC. It belongs
to the +19.9 km s-1 velocity component, with only one broad line identified in
the south. The +19.9 km s-1 component and the SNRC do not seem to be
associated. We find no spatial correlation between the SNRC and other broad
line components. G13.50+0.07: This SNRC is a plerion type. We find no good
spatial correlation result for the SNRC, because of its small size. We also
identify no broad line in it by full criteria. Based on our observation, we
cannot determine if the SNRC is associated with an MC. G13.55+0.35,
G13.63+0.30, and G13.65+0.26: SNRCs G13.55+0.35 and G13.65+0.26 overlap with
SNRC G13.63+0.30. Several broad line components are identified in SNRC
G13.55+0.35 by full criteria. As indicated by the SCC, molecular gas at
$\sim$+9.4 km s-1 that belongs to the +16.9 km s-1 broad line component is
spatially correlated with the SNRC, which is roughly surrounding the
southwestern radio continuum shell of the SNRC. No good spatial correlation is
found between the SNRC and other broad line components. Therefore, SNRC
G13.55+0.35 is probably associated with the +16.9 km s-1 component, with the
corresponding kinematic distance estimated as 1.8$\pm 0.1$ kpc. For SNRC
G13.63+0.30, only one broad line component at +22.2 km s-1 is identified in
it. The +22.2 km s-1 component is also spatially correlated with the SNRC, as
indicated by the SCC, of which molecular gas is roughly surrounding the SNRC.
We suggest that SNRC G13.63+0.30 is associated with the +22.2 km s-1
component, and its kinematic distance can be estimated as 3.0$\pm 0.4$ kpc.
For SNRC G13.65+0.26, no broad line is identified in it by full criteria. As
indicated by the SCC, molecular gas at $\sim$+26.2 km s-1 is distributed
around the southeastern boundary of the SNRC, which belongs to the +25.1 km
s-1 component with broad line candidates identified by partial criteria. SNRC
G13.65+0.26 may be associated with the +25.1 km s-1 component, of which the
kinematic distance is estimated as 3.0$\pm 0.4$ kpc. SNRCs G13.63+0.30 and
G13.65+0.26 may be in the same neighborhood, but SNRC G13.55+0.35 is not
likely. G13.66-0.24: There are multiple broad line components identified in
this SNRC. Broad lines at +43.5 and +50.1 km s-1 can be attributed to the
nearby prominent component at +43.2 km s-1. Some broad lines at other
velocities are probably originated from an overlapped H ii region in the east.
As indicated by the SCC, only the +43.2 km s-1 broad line component shows some
spatial correlations with the SNRC, of which molecular gas is roughly
surrounding the SNRC. The kinematic evidence and the spatial correlation
result indicate that the SNRC is associated with the +43.2 km s-1 component.
The corresponding kinematic distance is estimated as 3.9$\pm 0.3$ kpc.
G14.52+0.14: This SNRC presents bright radio continuum emission in the
southeast and shell-like radio continuum emission around its southern half.
Several broad line components are identified in this SNRC. Three of them at
velocities of +26.2, +38.2, and +136.0 km s-1 show some spatial correlations
with the SNRC. The +26.2 km s-1 component is with some molecular clumps
distributed around the northeastern boundary of the SNRC. Molecular gas at
$\sim$+53.0 km s-1 that probably belongs to the +38.2 km s-1 component is
roughly surrounding the south of the SNRC. Molecular gas of the +136.0 km s-1
component is roughly surrounding the southeast of the SNRC. Any of these three
components may be associated with the SNRC. The near and far kinematic
distances of the +26.2 km s-1 component are estimated as 3.0$\pm 0.4$ and
13.3$\pm 0.3$ kpc, respectively. Kinematic distances of the +38.2 and +136.0
km s-1 components are estimated as 3.9$\pm 0.3$ and 7.9$\pm 1.9$ kpc,
respectively. G15.51-0.15: Only one broad line component at +50.6 km s-1 is
identified in this SNRC. At a peak of the SCC at $\sim$+58.3 km s-1, molecular
gas is roughly surrounding the SNRC, which supports the association between
the SNRC and the +50.6 km s-1 broad line component. Therefore, we suggest that
the SNRC is associated with the +50.6 km s-1 component with the corresponding
kinematic distance estimated as 3.9$\pm 0.3$ kpc. G15.86+0.52, G16.02+0.75,
and G16.13+0.69: Both SNRCs G15.86+0.52 and G16.02+0.75 overlap with SNRC
G16.13+0.69. No broad line is identified in SNRC G15.86+0.52 even by partial
criteria. Molecular gas at a nonsignificant peak of the SCC at $\sim$+33.2 km
s-1 is distributed around the eastern boundary of it but not well correlated.
For SNRC G16.02+0.75, two broad line components are identified in it. As
indicated by the SCC, molecular gases at $\sim$+15.7 and $\sim$+27.5 km s-1
show spatial correlation with it. Molecular gas at $\sim$+15.7 km s-1 is
surrounding its southern half, which belongs to the +14.6 km s-1 component
with a broad line candidate identified in the SNRC by partial criteria.
Molecular gas at $\sim$+27.5 km s-1 is surrounding its east and south, which
belongs to the +30.1 km s-1 broad line component. The other broad line
component at +42.7 km s-1 shows no spatial correlation with the SNRC.
Therefore, SNRC G16.02+0.75 may be associated with the +14.6 or +30.1 km s-1
components, of which corresponding kinematic distances are estimated as
1.4$\pm 0.3$ and 1.50$\pm 0.04$ kpc. Kinematic distances of both velocity
components are consistent, both of which are probably located at the near side
of the Sagittarius spiral arm. SNRC G16.13+0.69 is large, and its radio
continuum emission is weak. Several broad line components are identified in
it. As indicated by the SCC, the +19.9 and +52.6 km s-1 broad line components
show some spatial correlations with the SNRC. Molecular gas at $\sim$+23.5 km
s-1 is roughly surrounding the north of the SNRC, and some molecular clumps at
$\sim$+50.2 km s-1 are distributed around the boundary of the SNRC’s southern
half. When using full criteria plus the clean subbackground region condition,
two broad line components at +27.6 and +36.4 km s-1 are identified in the SNR.
The +27.6 km s-1 component has substantial molecular gas distributed in the
remnant, which seems not correlated with the remnant. The +36.4 km s-1
component has a shell-like structure surrounding the southeastern boundary of
the remnant, nevertheless, it also has molecular gas distributed in the SNRC.
Note that some molecular gases of the +52.6 km s-1 component seems to
originate from the +36.4 km s-1 component. These spatial correlation results
are undetermined, since the weak radio continuum emission of the SNRC has no
clear spatial structure. The +19.9, +36.4, or +52.6 km s-1 components may be
associated with SNRC G16.13+0.69, and their kinematic distances are estimated
as 1.8$\pm 0.1$, 3.3$\pm 0.9$, and 3.6$\pm 0.4$ kpc, respectively.
G16.36-0.18: We identify no broad line in this SNRC by full criteria. We also
find no good spatial correlation result for the SNRC, because of its small
size. G16.96-0.93: Broad lines are identified in this SNRC at +40.3 and +45.0
km s-1. Broad lines at +40.3 km s-1 are probably originated from the nearby
+45.0 km s-1 component. Molecular gas at a peak of the SCC at $\sim$+28.6 km
s-1 is distributed along the southern radio continuum shell of the SNRC, which
probably originated from the +45.0 km s-1 component. Based on these evidences,
we suggest that the SNRC is associated with the +45.0 km s-1 component, and
its kinematic distance can be estimated as 3.3$\pm 0.3$ kpc. G17.34-0.14: No
broad line is identified in this SNRC by full criteria. Only one broad line
candidate at $-$8.7 km s-1 is identified in it by partial criteria, which is
probably originated from an overlapped H ii region. We also find no good
spatial correlation result for the SNRC because of its small size.
G17.43+0.27: No broad line is identified in this SNRC by full criteria. The
SCC peaks at $\sim$+21.7 km s-1, where molecular gas is roughly surrounding
the northeast of the SNRC; however, no corresponding broad line candidate is
identified even by partial criteria. G17.59+0.24: No broad line is identified
in this SNRC by full criteria. The SNRC is a bit small, nevertheless, possible
spatial correlations are found between it and molecular gas at $\sim$+21.3 and
$\sim$+46.2 km s-1, both of which are roughly surrounding the south and east
of the SNRC. They belong to the +24.4 and +46.5 km s-1 components,
respectively, which are with broad line candidates identified in the SNRC by
partial criteria. The SNRC may be associated with the +24.4 or +46.5 km s-1
components, of which kinematic distances are estimated as 1.50$\pm 0.05$ and
3.2$\pm 0.3$ kpc, respectively. G17.62+0.09: This SNRC presents shell-like
radio continuum emission in the west, and it overlaps multiple H ii regions
around +17 km s-1. Several broad line components are identified in the SNRC.
As indicated by the SCC, only the +16.9 km s-1 broad line component is
spatially correlated with the radio continuum shell of the SNRC, of which
molecular gas at $\sim$+20.6 km s-1 is roughly surrounding the west half of
it. These evidences indicate that the SNRC is associated with the +16.9 km s-1
component, hence, associated with overlapped H ii regions. The corresponding
near and far kinematic distances are estimated as 1.5$\pm 0.1$ and 13.3$\pm
0.4$ kpc, respectively. G17.80-0.02: Several broad line components are
identified in this SNRC. As indicated by the SCC, molecular gas at $\sim$+35.2
km s-1, belonging to the +47.0 km s-1 broad line component, presents a cavity-
like structure around the SNRC. No spatial correlation is found for other
broad line components. These evidences indicate that the SNRC is associated
with the +47.0 km s-1 component, and the corresponding near and far kinematic
distances are estimated as 4.0$\pm 0.4$ and 12.0$\pm 0.3$ kpc, respectively.
G18.39-0.82 and G18.53-0.86: These two SNRC overlap each other. Broad lines
are identified in SNRC G18.39-0.82 at +48.8 and +51.6 km s-1. Broad lines at
+51.6 km s-1 can be attributed to the nearby component at +48.8 km s-1.
Molecular gas at a minor peak of the SCC at $\sim$+61.7 km s-1 is surrounding
the northern half of the SNRC, which belongs to the +48.8 km s-1 broad line
component. Based on these evidences, SNRC G18.39-0.82 is probably associated
with the +48.8 km s-1 component, with the corresponding kinematic distance
estimated as 3.3$\pm 0.3$ kpc. SNRC G18.53-0.86 presents bright shell-like
radio continuum emission in the southeast. Three broad line components are
identified in this SNRC. However, broad line points at +48.8 and +51.6 km s-1
are in the overlapping region with SNRC G18.39-0.82, all of which are probably
originated from the +48.8 km s-1 component. As indicated by the SCC, molecular
gas at $\sim$+39.7 km s-1 is distributed around the SNRC, but not well
correlated with its radio continuum shell. It belongs to the +48.8 km s-1
broad line component. Moreover, molecular gas at $\sim$+71.7 km s-1, belonging
to the +65.6 km s-1 broad line component, is surrounding the northeast of the
SNRC. SNRC G18.53-0.86 may be associated with either the +48.8 or +65.6 km s-1
components. Kinematic distances are estimated as 3.3$\pm 0.3$ kpc for the
+48.8 km s-1 component and 3.9$\pm 0.4$ kpc for the +65.6 km s-1 component.
G19.1-3.1: Only one broad line component at +6.0 km s-1 is identified in this
SNRC. Molecular gas at the peak of the SCC at $\sim$+8.3 km s-1 is surrounding
the eastern half of the SNRC, which belongs to the +6.0 km s-1 component.
These evidences indicate that the SNRC is associated with the +6.0 km s-1
component, and the corresponding kinematic distance is estimated as 0.25$\pm
0.14$ kpc. G19.48-0.11: We identify several broad line components in this SNRC
even by full criteria plus the clean subbackground region condition. Molecular
gas at a nonsignificant peak of the SCC at $\sim$+72.9 km s-1 is roughly
surrounding the SNRC, which belongs to the +66.6 km s-1 broad line component.
Moreover, molecular gas at $\sim$+32.1 km s-1 is also distributed around the
boundary of the SNRC, which belongs to the +26.1 km s-1 broad line component.
The SNRC may be associated with either the +26.1 or +66.6 km s-1 components.
The near and far kinematic distances of the +26.1 km s-1 component are
estimated as 1.5$\pm 0.05$ and 11.8$\pm 0.3$ kpc, respectively. The kinematic
distance of the +66.6 km s-1 component is estimated as 4.1$\pm 0.5$ kpc.
G19.7-0.7: Two broad line components at +44.0 and +64.6 km s-1 are identified
in this SNRC. As indicated by the SCC, molecular gas at $\sim$+67.1 km s-1 is
distributed around the SNRC but not correlated well. No good spatial
correlation is found between the SNRC and the +44.0 km s-1 broad line
component. These evidences indicate a possible association between the SNRC
and the +64.6 km s-1 component, of which the kinematic distance is estimated
as 4.1$\pm 0.4$ kpc. G19.75+0.20: Several broad line components are identified
in this SNRC. A broad line at +108.9 km s-1 can be attributed to the nearby
prominent component at +123.5 km s-1. Molecular gas at the peak of the SCC at
$\sim$+109.8 km s-1 is roughly surrounding the southeast of the SNRC. In
addition, molecular gas at $\sim$+125.4 km s-1 is roughly surrounding the
southwest of the SNRC. These molecular gases belong to the +123.5 km s-1 broad
line component. The SNRC may be associated with the +123.5 km s-1 component
with the corresponding kinematic distance estimated as 9.4$\pm 0.4$ kpc.
G19.96-0.33: The north of this SNRC overlaps with SNR G20.0-0.2, and the east
of it overlaps with an H ii region at +67.3 km s-1. Three broad line
components are identified in the SNRC. Only one broad line is identified at
+57.5 km s-1, which is probably originated from the nearby prominent component
at +65.8 km s-1. The SCC indicates a spatial correlation between the SNRC and
the +65.8 km s-1 broad line component, of which molecular gas at $\sim$+58.3
km s-1 is roughly surrounding the SNRC. No spatial correlation is found
between the SNRC and the +28.9 km s-1 broad line component. Therefore, we
suggest that the SNRC is associated with the +65.8 km s-1 MC, and the
kinematic distance can be estimated as 4.0$\pm 0.6$ kpc. SNRC G19.96-0.33, SNR
G20.0-0.2, and the overlapped H ii region are probably in the same
neighborhood. G20.20+0.03: Three broad line components are identified in this
SNRC. However, only one broad line is identified at +71.1 km s-1, which can be
attributed to the nearby prominent component at +77.5 km s-1. As indicated by
the SCC, the +77.5 km s-1 broad line component is spatially correlated with
the SNRC, of which molecular gas at $\sim$+64.8 km s-1 is roughly surrounding
the whole SNRC except for its southeast side. The +25.6 km s-1 broad line
component shows no spatial correlation with the SNRC. These evidences indicate
that the SNRC is associated with the +77.5 km s-1 component, and its kinematic
distance can be estimated as 4.4$\pm 0.5$ kpc. G20.26-0.86: Among three broad
line components identified in this SNRC, only that at +40.0 km s-1 shows some
spatial correlations with the SNRC. Molecular gas at the peak of the SCC at
$\sim$+48.7 km s-1 is distributed around the SNRC. Therefore, we suggest that
the SNRC is associated with the +40.0 km s-1 component with the corresponding
kinematic distance estimated as 3.3$\pm 0.3$ kpc. G20.30-0.06: Two broad line
components are identified in this SNRC. No significant spatial correlation
result is found. Molecular gas of the +50.5 km s-1 broad line component is
distributed around the northeastern and southwestern boundaries of the SNRC,
and molecular gas of the +73.2 km s-1 broad line component is mostly
distributed in the eastern half of it. The SNRC may be associated with either
the +50.5 or +73.2 km s-1 components. Kinematic distances are estimated as
4.2$\pm 0.5$ kpc for the +50.5 km s-1 component and 4.4$\pm 0.4$ kpc for the
+73.2 km s-1 component. Both components are probably located at the near side
of the Norma spiral arm. G21.49-0.01 and G21.60-0.18: A small part of SNRC
G21.49-0.01 overlaps with the northwest of SNRC G21.60-0.18. Several broad
line components are identified in SNRC G21.49-0.01. As indicated by the SCC,
the +67.2 and +91.2 km s-1 broad line components show some spatial
correlations with the SNRC. Molecular gas at $\sim$+72.1 km s-1 belonging to
the +67.2 km s-1 component is surrounding the northwest and southeast of the
SNRC, and molecular gases at $\sim$+91.6 and $\sim$+102.5 km s-1 belonging to
the +91.2 km s-1 component are roughly surrounding the north and southeast of
the SNRC, respectively. The +91.2 km s-1 component is also with broad lines
identified by full criteria plus the clean subbackground region condition.
SNRC G21.49-0.01 may be associated with either the +67.2 or +91.2 km s-1
components. The kinematic distance of the +67.2 km s-1 component is estimated
as 4.7$\pm 0.4$ kpc, and the near and far kinematic distances of the +91.2 km
s-1 component are estimated as 4.6$\pm 0.6$ and 8.7$\pm 2.3$ kpc,
respectively. For SNRC G21.60-0.18, multiple broad line components are
identified in it by full criteria. Broad lines at +61.3 and +93.3 km s-1 are
probably originated from the nearby prominent components at +69.7 and +85.0 km
s-1, respectively. When using full criteria plus the clean subbackground
region condition, only one broad line at +69.7 km s-1 is identified in the
SNRC. Shell-like radio continuum emission is present in the southeastern half
of the SNRC. Molecular gas of the +45.3 km s-1 broad line component is
surrounding the southeastern half of the SNRC, which shows good spatial
correlation with its radio continuum shell. Molecular clumps of the +85.0 km
s-1 broad line component are also distributed around the southeastern boundary
of the SNRC. SNRC G21.60-0.18 may be associated with either the +45.3 or +85.0
km s-1 components. Kinematic distances are estimated as 3.3$\pm 0.4$ kpc for
the +45.3 km s-1 component and 4.6$\pm 0.5$ kpc for the +85.0 km s-1
component. Note that molecular gases of the +6.1 and +69.7 km s-1 broad line
components are not spatially correlated with the radio continuum shell of the
SNRC; however, some molecular gases of them at minor peaks of the SCC are
distributed around the SNRC. The association between SNRC G21.60-0.18 and
either of these two components is not totally ruled out. Kinematic distances
of the +6.1 and +69.7 km s-1 components are estimated as 15.0$\pm 0.4$ and
4.6$\pm 0.5$ kpc, respectively. G21.68+0.13: Several broad line components are
identified in this SNRC. As indicated by the SCC, molecular gas at $\sim$+76.0
km s-1 is surrounding the south of the SNRC and is also distributed around its
northern boundary, which belongs to the +78.2 km s-1 broad line component. The
+113.7 km s-1 broad line component also shows some spatial correlations with
the SNRC, with molecular gas at $\sim$+108.6 km s-1 roughly surrounding its
east and molecular gas at $\sim$+112.1 km s-1 distributed around its northern
boundary. The SNRC may be associated with either the +78.2 or +113.7 km s-1
components. Their kinematic distances are estimated as 4.7$\pm 0.4$ and
8.0$\pm 1.3$ kpc, respectively. G21.8-3.0: No broad line is identified in this
SNRC by full criteria. The SCC indicates that molecular gas at $\sim$+6.7 km
s-1 is distributed around the SNRC, mostly around its western half, which
belongs to the +3.2 km s-1 component with broad lines identified in the SNRC
by partial criteria. The SNRC may be associated with the +3.2 km s-1 component
with the corresponding kinematic distance estimated as 0.24$\pm 0.13$ kpc.
G21.86+0.17: Several broad line components are identified in this SNRC. As
indicated by the SCC, molecular gas of the +47.8 km s-1 broad line component
is roughly surrounding the east and south of the SNRC, where a partial radio
continuum shell is present. Therefore, we suggest that the SNRC is associated
with the +47.8 km s-1 component, of which the kinematic distance can be
estimated as 3.3$\pm 0.4$ kpc. G22.05-0.03: We identify two broad components
in this SNRC at +74.6 and +91.7 km s-1. Both broad line components have
molecular gases roughly distributed around the SNRC. The SNRC may be
associated with the +74.6 or +91.7 km s-1 components, of which kinematic
distances are estimated 4.7$\pm 0.4$ and 4.7$\pm 0.5$ kpc, respectively. Both
of the two components are probably located at the near side of the Norma
spiral arm. G22.18+0.31 and G22.32+0.11: These two SNRCs are adjacent to each
other. SNRC G22.18+0.31 is relatively large, and its radio continuum emission
is weak. We identify multiple broad line components in it by full criteria.
Broad lines at +13.3 km s-1 are probably originated from the nearby prominent
component at +7.0 km s-1. Three broad line components, i.e. at +7.0, +54.6,
and +85.2 km s-1, are with molecular gases roughly surrounding parts of the
SNRC. The +85.2 km s-1 component is also with one broad line identified in the
SNRC by full criteria plus the clean subbackground region condition. Any of
these three components may be associated with SNRC G22.18+0.31. Kinematic
distances are estimated as 15.0$\pm 0.4$, 3.3$\pm 0.4$, and 4.7$\pm 0.5$ kpc,
respectively. For SNRC G22.32+0.11, we identify multiple broad line components
in it by full criteria too. Only one broad line is identified at +55.1 km s-1,
which is probably originated from the nearby +50.3 km s-1 component. The +50.3
km s-1 component also has a broad line identified in the SNRC by full criteria
plus the clean subbackground region condition. As indicated by the SCC, both
the +15.8 and +50.3 km s-1 components are with molecular gases roughly
surrounding parts of the SNRC. SNRC G22.32+0.11 may be associated with the
+15.8 or +50.3 km s-1 components. Their kinematic distances are estimated as
1.5$\pm 0.04$ and 3.3$\pm 0.4$ kpc, respectively. G22.95-0.31: Two broad line
components are identified in this SNRC at +31.5 and +75.1 km s-1. As indicated
by the SCC, only the +75.1 km s-1 broad line component shows some spatial
correlations with the SNRC, of which molecular gas is roughly surrounding the
SNRC. Therefore, we suggest that the SNRC is associated with the +75.1 km s-1
component with the kinematic distance estimated as 4.8$\pm 0.5$ kpc.
G23.1+0.1: There are several H ii regions adjacent to this SNRC at velocities
of about +78, +90, and +108 km s-1. We identify multiple broad line components
in the SNRC by full criteria. However, only the +92.7 km s-1 component is with
broad lines identified in the SNRC by full criteria plus the clean
subbackground region condition. Broad lines at +75.1 km s-1 have wide velocity
ranges, which can be attributed to nearby prominent component at +92.7 km s-1.
Kinematic distances estimated for the +75.1 and +92.7 km s-1 components are
consistent. Some broad lines at +105.6 km s-1 are probably originated from the
+92.7 km s-1 component too. The SCC indicates a spatial correlation between
the SNRC and molecular gas at $\sim$+83.5 km s-1, which is roughly surrounding
radio continuum bright parts of the SNRC, i.e. the southeastern half and
northwest. It supports the association between the SNRC and the +92.7 km s-1
component. The SNRC is probably associated with the +92.7 km s-1 component.
However, the +4.8 and +65.1 km s-1 broad line components also show some
spatial correlations with the SNRC, of which molecular gases are roughly
surrounding the south of it. It is also possible that the SNRC is associated
with the +4.8 or +65.1 km s-1 components. The kinematic distance estimated for
the +92.7 km s-1 component is 5.1$\pm 0.6$ kpc. For the +4.8 and +65.1 km s-1
components, kinematic distances are estimated as 15.0$\pm 0.4$ and 4.9$\pm
0.5$ kpc, respectively. G23.85-0.18 and G24.0-0.3: These two SNRCs overlap
each other. SNRC G24.0-0.3 is much larger than SNRC G23.85-0.18. Two broad
line components are identified in SNRC G23.85-0.18 at +44.8 and +57.3 km s-1.
As indicated by the SCC, both show some spatial correlations with the SNRC.
Molecular gas of the +44.8 km s-1 component is roughly surrounding the north
and south of the SNRC, and molecular gas of the +57.3 km s-1 component roughly
surrounding the east of it. SNRC G23.85-0.18 may be associated with the +44.8
or +57.3 km s-1 components. Their kinematic distances are estimated as 3.7$\pm
0.4$ and 3.5$\pm 0.4$ kpc, respectively, which are consistent. Both of the two
components are probably located at the near side of the Scutum spiral arm.
SNRC G24.0-0.3 presents shell-like radio continuum emission in its northern
half. There are multiple broad line components identified in this SNRC by full
criteria. The +55.3 km s-1 broad line component presents a bubble-like
structure with inward protrusions, which has the same center as the SNRC but
has a smaller radius. In addition, the +55.3 km s-1 component is also with a
broad line identified by full criteria plus the clean subbackground region
condition. Molecular gas at a minor peak of the SCC at $\sim$+110.6 km s-1
also shows a spatial correlation with the SNRC, which is roughly surrounding
the bright radio continuum shell in the northeast. It belongs to the +111.6 km
s-1 broad line component. We find no good spatial correlation between the SNRC
and other broad line components. Therefore, SNRC G24.0-0.3 may be associated
with the +55.3 or +111.6 km s-1 components. Their kinematic distances are
estimated as 3.6$\pm 0.4$ and 7.1$\pm 0.9$ kpc, respectively. G23.97+0.51:
Three broad line components are identified in this SNRC at +94.5, +110.1, and
+110.3 km s-1. Only one broad line is identified at +110.3 km s-1, which can
be attributed to the nearby +110.1 km s-1 component. As indicated by the SCC,
both the +94.5 and +110.1 km s-1 components show some spatial correlations
with the SNRC. Molecular gas at $\sim$+99.4 km s-1 is distributed around the
northern boundary of the SNRC, and molecular gas at $\sim$+106.2 km s-1 is