$-$20 and $-$17 km s$^{-1}$, which are also connected in velocity. Our observational results suggest that the formation of massive stars appears to be triggered by a collision of two filamentary molecular clouds, which might have also influenced the birth of YSOs in AFGL 5157.'
author:
- 'L. K. Dewangan'
title: 'Cluster-forming site AFGL 5157: colliding filamentary clouds and star formation'
---

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Introduction {#sec:intro}
============

In the era of the space based telescopes like [*Spitzer*]{} and [*Herschel*]{}, the observational detections of mid-infrared bubbles/shells and filaments have provided several crucial inputs to researchers for understanding the star formation (SF) processes in Galactic star-forming sites [e.g., @churchwell06; @andre10; @andre14]. These observational inputs have been obtained through a detailed analysis of the infrared and sub-millimeter (sub-mm) data. Currently, the study concerning the involvement of filaments in the formation process of dense massive star-forming clumps and young stellar clusters has been received significant attention in the field of SF, which is still debated. In particular, the zones of merging/collision/interaction of filaments are considered a suitable environment for formation of massive OB stars ($\geq$ 8 M$_{\odot}$) and stellar clusters, where one may obtain higher column densities [e.g., @myers09; @andre10; @andre14; @galvan10; @duarte11; @schneider12; @inoue13; 