regions in AFGL 5157 [see also Figure 18 in @reipurth08]. The infrared shell is also highlighted by the 3.6 $\mu$m continuum emission contour. The locations of seven previously observed CS cores [@lee11] are also marked in Figure \[fig1\]a, and are found toward two sub-mm peaks (i.e., peak1 and peak2). Note that the sub-mm peak3 was not covered in the CS observations [see @lee11]. The direction in the figure is shown in the Galactic coordinates.

Previously, the signatures of ongoing SF were reported through the detection of molecular outflow, H$_{2}$O masers, H[ii]{} region, and several H$_{2}$ knots distributed toward the dense NH$_{3}$ core [see Figure 6 in @wolf17]. All these signposts are seen toward the sub-mm 850 $\mu$m continuum peak1 (see Figure \[fig1\]a). A detailed investigation of the sub-mm 850 $\mu$m continuum source (i.e., peak3) is not available in the literature. Recently, using high-resolution NH$_{3}$ line observations (resolution $\sim$2$''$.5), @fontani12 observed two ammonia filaments in the direction of this dense NH$_{3}$ core/region (see Figure 1 in their paper). These authors traced the dense regions with NH$_{3}$ (1, 1) emission in a velocity range of \[$-$17, $-$18.4\] km s$^{-1}$ (see Table 1 in their paper). They found the seven CS cores, observed 