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We observationally investigate star formation (SF) process occurring in AFGL5157 (area ~13.5 pc X 13.5 pc) using a multi-wavelength approach. Embeddedfilaments are seen in the {\it Herschel} column density map, and one of them isidentified as an elongated filamentary feature (FF) (length ~8.3 pc; mass ~1170Msun). Five Herschel clumps (Mclump ~45-300 Msun) are traced in the centralpart of FF, where an extended temperature structure (Td ~13.5-26.5 K) isobserved. In the direction of the central part of FF, the warmer region at Td~20-26.5 K spatially coincides with a mid-infrared (MIR) shell surrounding apreviously known evolved infrared cluster. Diffuse H-alpha emission is tracedinside the infrared shell, suggesting the presence of massive stars in theevolved cluster. Based on the surface density analysis of young stellar objects(YSOs), embedded clusters of YSOs are traced toward the central part of FF, andare distributed around the infrared shell. Previously detected H2O masers, H2knots, massive protostar candidates, and HII region are also seen toward theembedded clusters. Using the 12CO and 13CO line data, the central part of FF isobserved at the overlapping zones of two filamentary molecular clouds (length~12.5 pc) around -20 and -17 km/s, which are also connected in velocity. Ourobservational results suggest that the formation of massive stars appears to betriggered by a collision of two filamentary molecular clouds, which might havealso influenced the birth of YSOs in AFGL 5157.

Cluster-forming site AFGL 5157: colliding filamentary clouds and star formation