A Holistic Perspective on the Dynamics of G035.39-00.33: The Interplay between Gas and Magnetic Fields
文献类型：期刊论文
| 作者 | Liu,Tie2,3; Li,Pak Shing4; Juvela,Mika5; Kim,Kee-Tae2; Evans II,Neal J.2,6; Francesco,James Di7,8; Liu,Sheng-Yuan9; Yuan,Jinghua10 ; Tatematsu,Ken’ichi11; Zhang,Qizhou12
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| 刊名 | The Astrophysical Journal
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| 出版日期 | 2018-06-04 |
| 卷号 | 859期号:2 |
| ISSN号 | 0004-637X |
| 关键词 | ISM: clouds ISM: magnetic fields stars: formation |
| DOI | 10.3847/1538-4357/aac025 |
| 英文摘要 | Abstract Magnetic field plays a crucial role in shaping molecular clouds and regulating star formation, yet the complete information on the magnetic field is not well constrained owing to the limitations in observations. We study the magnetic field in the massive infrared dark cloud G035.39-00.33 from dust continuum polarization observations at 850 μm with SCUBA-2/POL-2 at JCMT for the first time. The magnetic field tends to be perpendicular to the densest part of the main filament (FM), whereas it has a less defined relative orientation in the rest of the structure, where it tends to be parallel to some diffuse regions. A mean plane-of-the-sky magnetic field strength of ～50 μG for FM is obtained using the Davis–Chandrasekhar–Fermi method. Based on 13CO (1–0) line observations, we suggest a formation scenario of FM due to large-scale (～10 pc) cloud–cloud collision. Using additional NH3 line data, we estimate that FM will be gravitationally unstable if it is only supported by thermal pressure and turbulence. The northern part of FM, however, can be stabilized by a modest additional support from the local magnetic field. The middle and southern parts of FM are likely unstable even if the magnetic field support is taken into account. We claim that the clumps in FM may be supported by turbulence and magnetic fields against gravitational collapse. Finally, we identified for the first time a massive (～200 M⊙), collapsing starless clump candidate, “c8,” in G035.39-00.33. The magnetic field surrounding “c8” is likely pinched, hinting at an accretion flow along the filament. |
| 语种 | 英语 |
| 出版者 | The American Astronomical Society |
| WOS记录号 | IOP:0004-637X-859-2-AAC025 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/35520]  |
| 专题 | 中国科学院国家天文台 |
| 作者单位 | 1.Institute of Astronomy and Department of Physics, National Tsing Hua University, Hsinchu, Taiwan 2.Korea Astronomy and Space Science Institute, 776 Daedeokdaero, Yuseong-gu, Daejeon 34055, Republic of Korea; liutiepku@gmail.com 3.East Asian Observatory, 660 N. A’ohoku Place, Hilo, HI 96720, USA 4.Astronomy Department, University of California, Berkeley, CA 94720, USA 5.Department of Physics, P.O. Box 64, FI-00014, University of Helsinki, Finland 6.Department of Astronomy, University of Texas at Austin, 2515 Speedway, Stop C1400, Austin, TX 78712-1205, USA 7.NRC Herzberg Astronomy and Astrophysics, 5071 West Saanich Rd., Victoria, BC V9E 2E7, Canada 8.Department of Physics and Astronomy, University of Victoria, Victoria, BC V8P 5C2, Canada 9.Institute of Astronomy and Astrophysics, Academia Sinica. 11F of Astronomy-Mathematics Building, AS/NTU No.1, Sec. 4, Roosevelt Rd, Taipei 10617, Taiwan 10.National Astronomical Observatories, Chinese Academy of Sciences, Beijing, 100012, People’s Republic of China |
| 推荐引用方式 GB/T 7714 | Liu,Tie,Li,Pak Shing,Juvela,Mika,et al. A Holistic Perspective on the Dynamics of G035.39-00.33: The Interplay between Gas and Magnetic Fields[J]. The Astrophysical Journal,2018,859(2). |
| APA | Liu,Tie.,Li,Pak Shing.,Juvela,Mika.,Kim,Kee-Tae.,Evans II,Neal J..,...&Zhang,H.-W..(2018).A Holistic Perspective on the Dynamics of G035.39-00.33: The Interplay between Gas and Magnetic Fields.The Astrophysical Journal,859(2). |
| MLA | Liu,Tie,et al."A Holistic Perspective on the Dynamics of G035.39-00.33: The Interplay between Gas and Magnetic Fields".The Astrophysical Journal 859.2(2018). |
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来源：国家天文台
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