JCMT BISTRO Survey: Magnetic Fields within the Hub-filament Structure in IC 5146
文献类型：期刊论文
| 作者 | Wang,Jia-Wei1; Lai,Shih-Ping1; Eswaraiah,Chakali1,2; Pattle,Kate1; Francesco,James Di3,4; Johnstone,Doug3,4; Koch,Patrick M.5; Liu,Tie6,7; Tamura,Motohide8,9,10; Furuya,Ray S.11,12 |
| 刊名 | The Astrophysical Journal
 |
| 出版日期 | 2019-05-01 |
| 卷号 | 876期号:1 |
| 关键词 | ISM: individual objects (IC 5146) ISM: magnetic fields ISM: structure polarization radio continuum: ISM stars: formation |
| ISSN号 | 0004-637X |
| DOI | 10.3847/1538-4357/ab13a2 |
| 英文摘要 | Abstract We present the 850 μm polarization observations toward the IC?5146 filamentary cloud taken using the Submillimetre Common-User Bolometer Array 2 (SCUBA-2) and its associated polarimeter (POL-2), mounted on the James Clerk Maxwell Telescope, as part of the B-fields In STar forming Regions Observations. This work is aimed at revealing the magnetic field morphology within a core-scale (?1.0 pc) hub-filament structure (HFS) located at the end of a parsec-scale filament. To investigate whether the observed polarization traces the magnetic field in the HFS, we analyze the dependence between the observed polarization fraction and total intensity using a Bayesian approach with the polarization fraction described by the Rice likelihood function, which can correctly describe the probability density function of the observed polarization fraction for low signal-to-noise ratio data. We find a power-law dependence between the polarization fraction and total intensity with an index of 0.56 in AV?～?20–300 mag regions, suggesting that the dust grains in these dense regions can still be aligned with magnetic fields in the IC?5146 regions. Our polarization maps reveal a curved magnetic field, possibly dragged by the contraction along the parsec-scale filament. We further obtain a magnetic field strength of 0.5?±?0.2 mG toward the central hub using the Davis–Chandrasekhar–Fermi method, corresponding to a mass-to-flux criticality of ～1.3?±?0.4 and an Alfvénic Mach number of <0.6. These results suggest that gravity and magnetic field are currently of comparable importance in the HFS and that turbulence is less important. |
| 语种 | 英语 |
| WOS记录号 | IOP:0004-637X-876-1-AB13A2 |
| 出版者 | The American Astronomical Society |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/26205]  |
| 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 30013, Taiwan 2.CAS Key Laboratory of FAST, National Astronomical Observatories, Chinese Academy of Sciences, Beijing, People’s Republic of China 3.NRC Herzberg Astronomy and Astrophysics, 5071 West Saanich Road, Victoria, BC V9E 2E7, Canada 4.Department of Physics and Astronomy, University of Victoria, Victoria, BC V8P 5C2, Canada 5.Academia Sinica Institute of Astronomy and Astrophysics, P.O. Box 23-141, Taipei 10617, Taiwan 6.Korea Astronomy and Space Science Institute, 776 Daedeokdae-ro, Yuseong-gu, Daejeon 34055, Republic of Korea 7.East Asian Observatory, 660 N. A‘ohōkū Place, University Park, Hilo, HI 96720, USA 8.National Astronomical Observatory of Japan, National Institutes of Natural Sciences, Osawa, Mitaka, Tokyo 181-8588, Japan 9.Department of Astronomy, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan 10.Astrobiology Center, National Institutes of Natural Sciences, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan |
| 推荐引用方式 GB/T 7714 | Wang,Jia-Wei,Lai,Shih-Ping,Eswaraiah,Chakali,et al. JCMT BISTRO Survey: Magnetic Fields within the Hub-filament Structure in IC 5146[J]. The Astrophysical Journal,2019,876(1). |
| APA | Wang,Jia-Wei.,Lai,Shih-Ping.,Eswaraiah,Chakali.,Pattle,Kate.,Francesco,James Di.,...&Zhu,Lei.(2019).JCMT BISTRO Survey: Magnetic Fields within the Hub-filament Structure in IC 5146.The Astrophysical Journal,876(1). |
| MLA | Wang,Jia-Wei,et al."JCMT BISTRO Survey: Magnetic Fields within the Hub-filament Structure in IC 5146".The Astrophysical Journal 876.1(2019). |
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来源：国家天文台
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