The JCMT BISTRO Survey: The Magnetic Field of the Barnard 1 Star-forming Region
文献类型：期刊论文
| 作者 | Coudé,Simon1,2; Bastien,Pierre2,3; Houde,Martin4; Sadavoy,Sarah5; Friesen,Rachel6; Francesco,James Di7,8; Johnstone,Doug7,8; Mairs,Steve9; Hasegawa,Tetsuo10; Kwon,Woojin11,12 |
| 刊名 | The Astrophysical Journal
 |
| 出版日期 | 2019-05-29 |
| 卷号 | 877期号:2 |
| ISSN号 | 0004-637X |
| 关键词 | ISM: clouds ISM: individual objects (Barnard 1) ISM: magnetic fields polarization stars: formation submillimeter: ISM |
| DOI | 10.3847/1538-4357/ab1b23 |
| 英文摘要 | Abstract We present the POL-2 850 μm linear polarization map of the Barnard?1 clump in the Perseus molecular cloud complex from the B-fields In STar-forming Region Observations survey at the James Clerk Maxwell Telescope. We find a trend of decreasing polarization fraction as a function of total intensity, which we link to depolarization effects toward higher-density regions of the cloud. We then use the polarization data at 850 μm to infer the plane-of-sky orientation of the large-scale magnetic field in Barnard?1. This magnetic field runs north–south across most of the cloud, with the exception of B1-c, where it turns more east–west. From the dispersion of polarization angles, we calculate a turbulence correlation length of 5.0?±?2.″5 (1500 au) and a turbulent-to-total magnetic energy ratio of 0.5?±?0.3 inside the cloud. We combine this turbulent-to-total magnetic energy ratio with observations of NH3 molecular lines from the Green Bank Ammonia Survey to estimate the strength of the plane-of-sky component of the magnetic field through the Davis–Chandrasekhar–Fermi method. With a plane-of-sky amplitude of 120?±?60 μG and a criticality criterion λc?=?3.0?±?1.5, we find that Barnard?1 is a supercritical molecular cloud with a magnetic field nearly dominated by its turbulent component. |
| 语种 | 英语 |
| 出版者 | The American Astronomical Society |
| WOS记录号 | IOP:0004-637X-877-2-AB1B23 |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/26736]  |
| 专题 | 中国科学院紫金山天文台 |
| 作者单位 | 1.SOFIA Science Center, Universities Space Research Association, NASA Ames Research Center, M.S. N232-12, Moffett Field, CA 94035, USA scoude@sofia.usra.edu 2.Centre de Recherche en Astrophysique du Québec (CRAQ), Université de Montréal, Département de Physique, C.P. 6128 Succ. Centre-ville, Montréal, QC H3C 3J7, Canada 3.Institut de Recherche sur les Exoplanètes (iREx), Université de Montréal, Département de Physique, C.P. 6128 Succ. Centre-ville, Montréal, QC H3C 3J7, Canada 4.Department of Physics and Astronomy, The University of Western Ontario, 1151 Richmond Street, London, ON N6A 3K7, Canada 5.Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA 6.National Radio Astronomy Observatory, 520 Edgemont Rd., Charlottesville, VA 22903, USA 7.Department of Physics and Astronomy, University of Victoria, Victoria, BC V8P 1A1, Canada 8.NRC Herzberg Astronomy and Astrophysics, 5071 West Saanich Rd., Victoria, BC V9E 2E7, Canada 9.East Asian Observatory, 660 N. A‘ohōkū Place, University Park, Hilo, HI 96720, USA 10.National Astronomical Observatory of Japan, National Institutes of Natural Sciences, Osawa, Mitaka, Tokyo 181-8588, Japan |
| 推荐引用方式 GB/T 7714 | Coudé,Simon,Bastien,Pierre,Houde,Martin,et al. The JCMT BISTRO Survey: The Magnetic Field of the Barnard 1 Star-forming Region[J]. The Astrophysical Journal,2019,877(2). |
| APA | Coudé,Simon.,Bastien,Pierre.,Houde,Martin.,Sadavoy,Sarah.,Friesen,Rachel.,...&Zhu,Lei.(2019).The JCMT BISTRO Survey: The Magnetic Field of the Barnard 1 Star-forming Region.The Astrophysical Journal,877(2). |
| MLA | Coudé,Simon,et al."The JCMT BISTRO Survey: The Magnetic Field of the Barnard 1 Star-forming Region".The Astrophysical Journal 877.2(2019). |
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