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ALMA Observations Reveal No Preferred Outflow-filament and Outflow-magnetic Field Orientations in Protoclusters
Baug,T.1; Wang,Ke1; Liu,Tie2; Tang,Mengyao3; Zhang,Qizhou4; Li,Di5,6; Eswaraiah,Chakali5,7; Liu,Sheng-Yuan8; Tej,Anandmayee9; Goldsmith,Paul F.10; Bronfman,Leonardo11; Qin,Sheng-Li3; Tóth,Viktor L.12; Li,Pak-Shing13; Kim,Kee-Tae14,15
2020-02-10
Source PublicationThe Astrophysical Journal
ISSN0004-637X
Volume890Issue:1
AbstractAbstract 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.
KeywordStar formation Submillimeter astronomy H II regions Stellar jets Protoclusters Interstellar filaments Interstellar medium
DOI10.3847/1538-4357/ab66b6
Language英语
WOS IDIOP:0004-637X-890-1-ab66b6
PublisherThe American Astronomical Society
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/53960
Collection中国科学院国家天文台
Affiliation1.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
2.Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80 Nandan Road, Shanghai 200030, People's Republic of China
3.Department of Astronomy, Yunnan University, Kunming, 650091, People's Republic of China
4.Center for Astrophysics ∣ Harvard & Smithsonian, 60 Garden Street, Cambridge, MA 02138, USA
5.CAS Key Laboratory of FAST, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, People's Republic of China
6.University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China
7.National Astronomical Observatories, Chinese Academy of Science, A20 Datun Road, Chaoyang District, Beijing 100012, People's Republic of China
8.Academia Sinica, Institute of Astronomy and Astrophysics, P.O. Box 23-141, Taipei 106, Taiwan
9.Indian Institute of Space Science and Technology, Thiruvananthapuram 695 547, Kerala, India
10.Jet Propulsion Laboratory, California Institute of Technology, USA
11.Departamento de Astronomía, Universidad de Chile, Casilla 36-D, Santiago, Chile
12.E?v?s Loránd University, Department of Astronomy, Pázmány Péter sétány 1/A, H-1117, Budapest, Hungary
13.Astronomy Department, University of California, Berkeley, USA
14.Korea Astronomy and Space Science Institute, 776 Daedeokdae-ro, Yuseong-gu, Daejeon 34055, Republic of Korea
15.University of Science and Technology, Korea (UST), 217 Gajeong-ro, Yuseong-gu, Daejeon 34113, Republic of Korea
Recommended Citation
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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