Star formation in the Sh 2-53 region influenced by accreting molecular filaments

Abstract

We present a multi-wavelength analysis of a $\sim$30${}^{\prime }\times$30${}^{\prime }$ area around the Sh 2-53 region (hereafter S53 complex), which is associated with at least three H II regions, two mid-infrared bubbles (N21 and N22), and infrared dark clouds. The ${}^{13}$CO line data trace the molecular content of the S53 complex in a velocity range of 36--60 km s${}^{-1}$, and show the presence of at least three molecular components within the selected area along this direction. Using the observed radio continuum flux of the H II regions, the derived spectral types of the ionizing sources agree well with the previously reported results. The S53 complex harbors clusters of young stellar objects (YSOs) that are identified using the photometric 2--24 $\mu$m magnitudes. It also hosts several massive condensations (3000-30000 $M_{\odot }$) which are traced in the {\em Herschel} column density map. The complex is found at the junction of at least five molecular filaments, and the flow of gas toward the junction is evident in the velocity space of the ${}^{13}$CO data. Together, the S53 complex is embedded in a very similar "hub-filament" system to those reported in Myers, and the active star formation is evident towards the central "hub" inferred by the presence of the clustering of YSOs.

17 pages, 9 figures, 2 tables; Accepted in the ApJ

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• TRAO Survey of the nearby filamentary molecular clouds, the universal nursery of stars (TRAO FUNS). II. Filaments and Dense cores in IC 5146
• TRAO Survey of Nearby Filamentary Molecular clouds, the Universal Nursery of Stars (TRAO FUNS) I. Dynamics and Chemistry of L1478 in the California Molecular Cloud
• ATOMS: ALMA Three-millimeter Observations of Massive Star-forming regions -XIII. Ongoing triggered star formation within clump-fed scenario found in the massive ($\sim 1500$ ${\mathrm{M}}_{\odot }$) clump
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• Structure and Kinematics of Sh2-138 -- A distant hub-filament system in the outer Galactic plane
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• Research on the Interstellar Medium and Star Formation in the Galaxy: An Indian Perspective