ALMA Observations Reveal No Preferred Outflow-filament and Outflow-magnetic Field Orientations in Protoclusters
文献类型：期刊论文
| 作者 | Baug,T.2; Wang,Ke2; Liu,Tie3; Tang,Mengyao4; Zhang,Qizhou5; Li,Di1,6 ; Eswaraiah,Chakali6,14; Liu,Sheng-Yuan15; Tej,Anandmayee7; Goldsmith,Paul F.8
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| 刊名 | The Astrophysical Journal
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| 出版日期 | 2020-02-10 |
| 卷号 | 890期号:1 |
| 关键词 | Star formation Submillimeter astronomy H II regions Stellar jets Protoclusters Interstellar filaments Interstellar medium |
| ISSN号 | 0004-637X |
| DOI | 10.3847/1538-4357/ab66b6 |
| 英文摘要 | Abstract We present a statistical study of the orientation of outflows with respect to large-scale filaments and magnetic fields. Although filaments are widely observed toward Galactic star-forming regions, the exact role of filaments in star formation is unclear. Studies toward low-mass star-forming regions revealed both preferred and random orientations of outflows with respect to the filament long axes, while outflows in massive star-forming regions are mostly oriented perpendicular to the host filaments and parallel to the magnetic fields at similar physical scales. Here, we explore outflows in a sample of 11 protoclusters in H ii regions, a more evolved stage compared to infared dark clouds, using Atacama Large Millimeter/submillimeter Array CO (3–2) line observations. We identify a total of 105 outflow lobes in these protoclusters. Among the 11 targets, 7 are embedded within parsec-scale filamentary structures detected in 13CO line and 870 μm continuum emissions. The angles between outflow axes and corresponding filaments (γFil) do not show any hint of preferred orientations (i.e., orthogonal or parallel as inferred in numerical models) with respect to the position angle of the filaments. Identified outflow lobes are also not correlated with the magnetic fields and Galactic plane position angles. Outflows associated with filaments aligned along the large-scale magnetic fields are also randomly oriented. Our study presents the first statistical results of outflow orientation with respect to large-scale filaments and magnetic fields in evolved massive star-forming regions. The random distribution suggests a lack of alignment of outflows with filaments, which may be a result of the evolutionary stage of the clusters. |
| 语种 | 英语 |
| WOS记录号 | IOP:0004-637X-890-1-AB66B6 |
| 出版者 | The American Astronomical Society |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/53959]  |
| 专题 | 中国科学院国家天文台 |
| 作者单位 | 1.University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China 2.Kavli Institute for Astronomy and Astrophysics, Peking University, 5 Yiheyuan Road, Haidian District, Beijing 100871, People's Republic of China kwang.astro@pku.edu.cn 3.Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80 Nandan Road, Shanghai 200030, People's Republic of China 4.Department of Astronomy, Yunnan University, Kunming, 650091, People's Republic of China 5.Center for Astrophysics ∣ Harvard & Smithsonian, 60 Garden Street, Cambridge, MA 02138, USA 6.CAS Key Laboratory of FAST, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, People's Republic of China 7.Indian Institute of Space Science and Technology, Thiruvananthapuram 695 547, Kerala, India 8.Jet Propulsion Laboratory, California Institute of Technology, USA 9.Departamento de Astronomía, Universidad de Chile, Casilla 36-D, Santiago, Chile 10.E?v?s Loránd University, Department of Astronomy, Pázmány Péter sétány 1/A, H-1117, Budapest, Hungary |
| 推荐引用方式 GB/T 7714 | Baug,T.,Wang,Ke,Liu,Tie,et al. ALMA Observations Reveal No Preferred Outflow-filament and Outflow-magnetic Field Orientations in Protoclusters[J]. The Astrophysical Journal,2020,890(1). |
| APA | Baug,T..,Wang,Ke.,Liu,Tie.,Tang,Mengyao.,Zhang,Qizhou.,...&Kim,Kee-Tae.(2020).ALMA Observations Reveal No Preferred Outflow-filament and Outflow-magnetic Field Orientations in Protoclusters.The Astrophysical Journal,890(1). |
| MLA | Baug,T.,et al."ALMA Observations Reveal No Preferred Outflow-filament and Outflow-magnetic Field Orientations in Protoclusters".The Astrophysical Journal 890.1(2020). |
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来源：国家天文台
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