| Abstract : | Despite our vast understanding of the physical environment of star clusters (hosting massive stars), less is known about their formation processes. Several studies suggest that dust and molecular filaments play a central role in star formation processes. The system of several
filaments converging to a common zone is known as the hub-filament system (HFS) and is quite popular as a potential birthplace of massive stars. Furthermore, the isolated filaments are found to collapse at their edges, forming star clusters. Thus, the role of filaments in the star formation processes becomes a vital topic of discussion and demands careful multi-wavelength analysis. In this context, we have analyzed multi-wavelength data of a nearby filamentary system IC 5146 dark streamer (i.e., fl; d ~600 pc). At the eastern and western ends of fl, two HFSs were previously known. Our derived high-resolution hydrogen column density map (resolution ~13".5) indicates two intertwined sub-filaments (i.e., fl-A and fl-B) toward fl, revealing a nearly double helix-like structure. An identical signature is also observed in the C18O emission. The analysis of 13CO data hints at the collision of two cloud components (Velocity ~2 and ~4 km/s), explaining the origin of HFSs and the presence of several massive sources. The magnetic field position angle measured from the filament's major axis shows a linear trend along the filament. This signature is confirmed in the other nearby EDC filaments. Thus, it may present a more quantitative observational proxy of the EDC scenario. Based on our observational outcomes, we witness multiple physical processes operational in our target site. Overall, IC 5146 streamer can be recognized as the first reliable candidate of intertwined sub-filaments, edge collapse, and HFSs together. In this talk, the major outcomes of our work will be presented and discussed.
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