Universität zu Köln

Wang, Jia-Wei, Koch, Patrick M., Tang, Ya-Wen, Fuller, Gary A., Peretto, Nicolas ORCID: 0000-0002-6893-602X, Williams, Gwenllian M., Yen, Hsi-Wei, Lee, Han-Tsung ORCID: 0000-0002-9846-7017 and Chen, Wei-An (2022). Formation of the SDC13 Hub-filament System: A Cloud-Cloud Collision Imprinted on the Multiscale Magnetic Field. Astrophys. J., 931 (2). BRISTOL: IOP Publishing Ltd. ISSN 1538-4357

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Abstract

Hub-filament systems (HFSs) are potential sites of protocluster and massive star formation, and play a key role in mass accumulation. We report JCMT POL-2 850 mu m polarization observations toward the massive HFS SDC13. We detect an organized magnetic field near the hub center with a cloud-scale U-shape morphology following the western edge of the hub. Together with larger-scale APEX (CO)-C-13 and PLANCK polarization data, we find that SDC13 is located at the convergent point of three giant molecular clouds (GMCs) along a large-scale, partially spiral-like magnetic field. The smaller U-shape magnetic field is perpendicular to the large-scale magnetic field and the converging GMCs. We explain this as the result of a cloud-cloud collision. Within SDC13, we find that local gravity and velocity gradients point toward filament ridges and hub center. This suggests that gas can locally be pulled onto filaments and overall converges to the hub center. A virial analysis of the central hub shows that gravity dominates the magnetic and kinematic energy. Combining large- and small-scale analyses, we propose that SDC13 is initially formed from a collision of clouds moving along the large-scale magnetic field. In the post-shock regions, after the initial turbulent energy has dissipated, gravity takes over and starts to drive the gas accretion along the filaments toward the hub center.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Wang, Jia-Wei UNSPECIFIED UNSPECIFIED UNSPECIFIED Koch, Patrick M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Tang, Ya-Wen UNSPECIFIED UNSPECIFIED UNSPECIFIED Fuller, Gary A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Peretto, Nicolas UNSPECIFIED orcid.org/0000-0002-6893-602X UNSPECIFIED Williams, Gwenllian M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Yen, Hsi-Wei UNSPECIFIED UNSPECIFIED UNSPECIFIED Lee, Han-Tsung UNSPECIFIED orcid.org/0000-0002-9846-7017 UNSPECIFIED Chen, Wei-An UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-690267
DOI:	10.3847/1538-4357/ac6872
Journal or Publication Title:	Astrophys. J.
Volume:	931
Number:	2
Date:	2022
Publisher:	IOP Publishing Ltd
Place of Publication:	BRISTOL
ISSN:	1538-4357
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language POLARIZED THERMAL EMISSION; MOLECULAR CLOUDS; STAR-FORMATION; GRAVITATIONAL-INSTABILITY; DARK CLOUDS; SIMULATIONS; BISTRO; DUST; II.; 1ST Multiple languages Astronomy & Astrophysics Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/69026