Yang, WJ and Menten, KM and Yang, AY and Wyrowski, F and Gong, Y and Ellingsen, SP and Henkel, C and Chen, X and Xu, Y, Redshifted methanol absorption tracing infall motions of high-mass star formation regions, Astronomy & Astrophysics, 658 Article A192. ISSN 0004-6361 (2022) [Refereed Article]
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© W. J. Yang et al. 2022 Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution 4.0 International (CC BY 4.0) License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Aims: We aim to test if methanol transitions can be used to trace infall motions within high-mass star formation regions.
Methods: Using the Effelsberg-100 m, IRAM-30 m, and APEX-12 m telescopes, we carried out observations of 37 and 16 methanol transitions towards two well-known collapsing dense clumps, W31C (G10.6−0.4) and W3(OH), to search for redshifted absorption features or inverse P-Cygni profiles.
Results: Redshifted absorption is observed in 14 and 11 methanol transitions towards W31C and W3(OH), respectively. The infall velocities fitted from a simple two-layer model agree with previously reported values derived from other tracers, suggesting that redshifted methanol absorption is a reliable tracer of infall motions within high-mass star formation regions. Our observations indicate the presence of large-scale inward motions, and the mass infall rates are roughly estimated to be ≳10-3 M⊙ yr-1, which supports the global hierarchical collapse and clump-fed scenario.
Conclusions: With the aid of bright continuum sources and the overcooling of methanol transitions leading to enhanced absorption, redshifted methanol absorption can trace infall motions within high-mass star formation regions hosting bright H II regions.
|Item Type:||Refereed Article|
|Keywords:||stars: formation - ISM: kinematics and dynamics - ISM: individual objects: W3(OH) - ISM: individual objects: W31C(G10.6-0.4) - ISM: molecules - radio lines: ISM|
|Research Division:||Physical Sciences|
|Research Group:||Astronomical sciences|
|Research Field:||Galactic astronomy|
|Objective Division:||Expanding Knowledge|
|Objective Group:||Expanding knowledge|
|Objective Field:||Expanding knowledge in the physical sciences|
|UTAS Author:||Ellingsen, SP (Professor Simon Ellingsen)|
|Web of Science® Times Cited:||1|
|Deposited By:||Office of the School of Natural Sciences|
|Downloads:||3 View Download Statistics|
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