2022ApJ...934....2M -
Astrophys. J., 934, 2 (2022/July-3)
Unraveling the Observational Signatures of Cloud-Cloud Collision and Hub-filament Systems in W31.
MAITY A.K., DEWANGAN L.K., SANO H., TACHIHARA K., FUKUI Y. and BHADARI N.K.
Abstract (from CDS):
To understand the formation process of massive stars, we present a multiscale and multiwavelength study of the W31 complex hosting two extended H II regions (i.e., G10.30-0.15 (hereafter, W31-N) and G10.15-0.34 (hereafter, W31-S)) powered by a cluster of O-type stars. Several Class I protostars and a total of 49 ATLASGAL 870 μm dust clumps (at d = 3.55 kpc) are found toward the H II regions where some of the clumps are associated with the molecular outflow activity. These results confirm the existence of a single physical system hosting the early phases of star formation. The Herschel 250 μm continuum map shows the presence of a hub-filament system (HFS) toward both W31-N and W31-S. The central hubs harbor H II regions and they are depicted with extended structures (with Td ∼ 25-32 K) in the Herschel temperature map. In the direction of W31-S, an analysis of the NANTEN2 12CO(J = 1-0) and SEDIGISM 13CO(J = 2-1) line data supports the presence of two cloud components around 8 and 16 km s–1, and their connection in velocity space. A spatial complementary distribution between the two cloud components is also investigated toward W31-S, where the signposts of star formation, including massive O-type stars, are concentrated. These findings favor the applicability of cloud-cloud collision (CCC) around ∼2 Myr ago in W31-S. Overall, our observational findings support the theoretical scenario of CCC in W31, which explains the formation of massive stars and the existence of HFSs.
Abstract Copyright:
© 2022. The Author(s). Published by the American Astronomical Society.
Journal keyword(s):
Star formation - Star forming regions - H II regions - Interstellar medium - Molecular clouds - Dust continuum emission - Interstellar emissions - Pre-main sequence stars - Young stellar objects ;
Simbad objects:
14
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