Redshifted methanol absorption tracing infall motions of high-mass star formation regions
文献类型：期刊论文
| 作者 | Yang, W. J.3 ; Menten, K. M.3; Yang, A. Y.3; Wyrowski, F.3; Gong, Y.3; Ellingsen, S. P.4; Henkel, C.1,3,5; Chen, X.6; Xu, Y.2
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| 刊名 | Astronomy & Astrophysics
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| 出版日期 | 2022-02-01 |
| 卷号 | 658页码:A192 |
| 关键词 | stars: formation ISM: kinematics and dynamics ISM: individual objects: W3(OH) ISM: individual objects: W31C(G10.6-0.4) ISM: molecules radio lines: ISM h-ii regions gravitational collapse ammonia absorption molecular clouds accretion flow dynamical collapse coordinated radio infrared survey dense gas 12.2 ghz Astronomy & Astrophysics |
| ISSN号 | 0004-6361 |
| DOI | 10.1051/0004-6361/202142811 |
| 产权排序 | 4 |
| 文献子类 | Article |
| 英文摘要 | Context. Gravitational collapse is one of the most important processes in high-mass star formation. Compared with the classic blue-skewed profiles, redshifted absorption against continuum emission is a more reliable method to detect inward motions within high-mass star formation regions. 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 greater than or similar to 10(-3) M-circle dot 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. |
| URL标识 | 查看原文 |
| 语种 | 英语 |
| WOS记录号 | WOS:000760424200006 |
| 源URL | [http://ir.xao.ac.cn/handle/45760611-7/5149]  |
| 专题 | 恒星形成与演化研究团组 |
| 作者单位 | 1.Xinjiang Astronomical Observatory, Chinese Academy of Sciences, Urumqi 830011, PR China; 2.Purple Mountain Observatory, Chinese Academy of Science, Nanjing 210023, PR China 3.Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany; 4.School of Natural Sciences, University of Tasmania, Private Bag 37, Hobart, Tasmania 7001, Australia; 5.Astronomy Department, Faculty of Science, King Abdulaziz University, PO Box 80203, Jeddah, 21589, Saudi Arabia; 6.Center for Astrophysics, GuangZhou University, Guangzhou 510006, PR China; |
| 推荐引用方式 GB/T 7714 | Yang, W. J.,Menten, K. M.,Yang, A. Y.,et al. Redshifted methanol absorption tracing infall motions of high-mass star formation regions[J]. Astronomy & Astrophysics,2022,658:A192. |
| APA | Yang, W. J..,Menten, K. M..,Yang, A. Y..,Wyrowski, F..,Gong, Y..,...&Xu, Y..(2022).Redshifted methanol absorption tracing infall motions of high-mass star formation regions.Astronomy & Astrophysics,658,A192. |
| MLA | Yang, W. J.,et al."Redshifted methanol absorption tracing infall motions of high-mass star formation regions".Astronomy & Astrophysics 658(2022):A192. |
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