$^{13}$CO(1-0) gas has been performed comparing its distribution against the infrared and sub-mm images. To trace the signatures of SF activity, a careful analysis of embedded YSOs is carried out for a large-scale area containing AFGL 5157.

In Section \[sec:obser\], we present details of the adopted data sets. Section \[sec:data\] provides the information of the physical environment at large-scale in AFGL 5157. Section \[sec:disc\] deals with the possible SF processes operational in our selected target site. Finally, Section \[sec:conc\] gives the main conclusions of this paper.

Data {#sec:obser}
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Our present work deals with an area of $\sim$0$\degr$.43 (13.5 pc) $\times$ 0$\degr$.43 (13.5 pc) (central coordinates: [*l*]{} = 176$\degr$.445; [*b*]{} = 0$\degr$.215) containing AFGL 5157. We analyzed the data sets in the optical, infrared, sub-mm, and radio regimes, which were obtained from several surveys. Table \[utab1a\] lists all these surveys.

Five College Radio Astronomy Observatory (FCRAO) $^{12}$CO(1-0) and $^{13}$CO(1-0) line data (velocity resolution $\sim$0.25 kms$^{-1}$) were employed in this paper, which were observed as part of the E-OGS. The E-OGS is known as an extended coverage of the FCRAO Outer Galaxy Survey [OGS; @heyer98]. Typical rms values for the spectra are 0.25 K for $^{12}$CO and 0.2 K for $^{13}$CO 