Observations of Magnetic Fields Surrounding LkHα 101 Taken by the BISTRO Survey with JCMT-POL-2
文献类型：期刊论文
| 作者 | Ngoc,Nguyen Bich3; Diep,Pham Ngoc3; Parsons,Harriet4; Pattle,Kate5; Hoang,Thiem7,8; Ward-Thompson,Derek9; Tram,Le Ngoc10; Hull,Charles L. H.11,12; Tahani,Mehrnoosh13; Furuya,Ray1 |
| 刊名 | The Astrophysical Journal
 |
| 出版日期 | 2021-02-01 |
| 卷号 | 908期号:1 |
| ISSN号 | 0004-637X |
| 关键词 | Interstellar magnetic fields Molecular clouds Star formation |
| DOI | 10.3847/1538-4357/abd0fc |
| 英文摘要 | Abstract We report the first high spatial resolution measurement of magnetic fields surrounding LkHα 101, part of the Auriga–California molecular cloud. The observations were taken with the POL-2 polarimeter on the James Clerk Maxwell Telescope within the framework of the B-fields In Star-forming Region Observations (BISTRO) survey. Observed polarization of thermal dust emission at 850 μm is found to be mostly associated with the redshifted gas component of the cloud. The magnetic field displays a relatively complex morphology. Two variants of the Davis–Chandrasekhar–Fermi method, unsharp masking and structure function, are used to calculate the strength of magnetic fields in the plane of the sky, yielding a similar result of BPOS?～?115 μG. The mass-to-magnetic-flux ratio in critical value units, λ?～?0.3, is the smallest among the values obtained for other regions surveyed by POL-2. This implies that the LkHα 101 region is subcritical, and the magnetic field is strong enough to prevent gravitational collapse. The inferred δB/B0?～?0.3 implies that the large-scale component of the magnetic field dominates the turbulent one. The variation of the polarization fraction with total emission intensity can be fitted by a power law with an index of α?=?0.82?±?0.03, which lies in the range previously reported for molecular clouds. We find that the polarization fraction decreases rapidly with proximity to the only early B star (LkHα 101) in the region. Magnetic field tangling and the joint effect of grain alignment and rotational disruption by radiative torques can potentially explain such a decreasing trend. |
| 语种 | 英语 |
| 出版者 | The American Astronomical Society |
| WOS记录号 | IOP:0004-637X-908-1-ABD0FC |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/60469]  |
| 专题 | 中国科学院国家天文台 |
| 通讯作者 | Diep,Pham Ngoc |
| 作者单位 | 1.Institute of Liberal Arts and Sciences Tokushima University, Minami Jousanajima-machi 1-1, Tokushima 770-8502, Japan 2.Astronomical Institute, Graduate School of Science, Tohoku University, Aoba-ku, Sendai, Miyagi 980-8578, Japan 3.Vietnam National Space Center, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Hanoi, Vietnam; pndiep@vnsc.org.vn 4.East Asian Observatory, 660 N. A’ohōkū Place, University Park, Hilo, HI 96720, USA 5.National University of Ireland Galway, University Road, Galway, H91 TK33, Ireland 6.Astrobiology Center, National Institutes of Natural Sciences, 2-21-1 Osawa, Mitaka, Tokyo 81-8588, Japan 7.Korea Astronomy and Space Science Institute, 776 Daedeokdae-ro, Yuseong-gu, Daejeon 34055, Republic of Korea 8.University of Science and Technology, Korea, 217 Gajeong-ro, Yuseong-gu, Daejeon 34113, Republic of Korea 9.Jeremiah Horrocks Institute, University of Central Lancashire, Preston PR1 2HE, UK 10.University of Science and Technology of Hanoi, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Hanoi, Vietnam |
| 推荐引用方式 GB/T 7714 | Ngoc,Nguyen Bich,Diep,Pham Ngoc,Parsons,Harriet,et al. Observations of Magnetic Fields Surrounding LkHα 101 Taken by the BISTRO Survey with JCMT-POL-2[J]. The Astrophysical Journal,2021,908(1). |
| APA | Ngoc,Nguyen Bich.,Diep,Pham Ngoc.,Parsons,Harriet.,Pattle,Kate.,Hoang,Thiem.,...&van Loo,Sven.(2021).Observations of Magnetic Fields Surrounding LkHα 101 Taken by the BISTRO Survey with JCMT-POL-2.The Astrophysical Journal,908(1). |
| MLA | Ngoc,Nguyen Bich,et al."Observations of Magnetic Fields Surrounding LkHα 101 Taken by the BISTRO Survey with JCMT-POL-2".The Astrophysical Journal 908.1(2021). |
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