The JCMT BISTRO Survey: The Magnetic Field in the Starless Core ρ Ophiuchus C

doi:10.3847/1538-4357/ab0958

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	The JCMT BISTRO Survey: The Magnetic Field in the Starless Core ρ Ophiuchus C
	Liu,Junhao 1,2,3; Qiu,Keping 1,2; Berry,David 4; Di Francesco,James 5,6; Bastien,Pierre 7,8; Koch,Patrick M.9; Furuya,Ray S.10,11; Kim,Kee-Tae 12; Coudé,Simon 8,13; Lee,Chang Won 12,14
刊名	The Astrophysical Journal
	2019-05-22
卷号	877 期号:1 页码:43
关键词	ISM: individual objects (Ophiuchus) magnetic fields polarization stars: formation
ISSN号	0004-637X
DOI	10.3847/1538-4357/ab0958
产权排序	23
英文摘要	We report 850?μm dust polarization observations of a low-mass (～12 M⊙) starless core in the ρ Ophiuchus cloud, Ophiuchus C, made with the POL-2 instrument on the James Clerk Maxwell Telescope (JCMT) as part of the JCMT B-fields In STar-forming Region Observations survey. We detect an ordered magnetic field projected on the plane of the sky in the starless core. The magnetic field across the ～0.1?pc core shows a predominant northeast–southwest orientation centering between ～40° and ～100°, indicating that the field in the core is well aligned with the magnetic field in lower-density regions of the cloud probed by near-infrared observations and also the cloud-scale magnetic field traced by Planck observations. The polarization percentage (P) decreases with increasing total intensity (I), with a power-law index of ?1.03?±?0.05. We estimate the plane-of-sky field strength (Bpos) using modified Davis–Chandrasekhar–Fermi methods based on structure function (SF), autocorrelation function (ACF), and unsharp masking (UM) analyses. We find that the estimates from the SF, ACF, and UM methods yield strengths of 103?±?46 μG, 136?±?69 μG, and 213?±?115 μG, respectively. Our calculations suggest that the Ophiuchus C core is near magnetically critical or slightly magnetically supercritical (i.e., unstable to collapse). The total magnetic energy calculated from the SF method is comparable to the turbulent energy in Ophiuchus C, while the ACF method and the UM method only set upper limits for the total magnetic energy because of large uncertainties.
语种	英语
出版者	The American Astronomical Society
WOS记录号	WOS:000468874600011
内容类型	期刊论文
源URL	[http://ir.xao.ac.cn/handle/45760611-7/3206]
专题	研究单元未命名
作者单位	1.School of Astronomy and Space Science, Nanjing University, 163 Xianlin Avenue, Nanjing 210023, People’s Republic of China; kpqiu@nju.edu.cn 2.Key Laboratory of Modern Astronomy and Astrophysics (Nanjing University), Ministry of Education, Nanjing 210023, People’s Republic of China 3.Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA 4.East Asian Observatory, 660 N. A‘ohōkū Place, University Park, Hilo, HI 96720, USA 5.NRC Herzberg Astronomy and Astrophysics, 5071 West Saanich Road, Victoria, BC V9E 2E7, Canada 6.Department of Physics and Astronomy, University of Victoria, Victoria, BC V8P 1A1, Canada 7.Institut de Recherche sur les Exoplanètes (iREx), Université de Montréal, Département de Physique, C.P. 6128 Succ. Centre-ville, Montréal, QC, H3C 3J7, Canada 8.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 9.Academia Sinica Institute of Astronomy and Astrophysics, P.O. Box 23-141, Taipei 10617, Taiwan 10.Tokushima University, Minami Jousanajima-machi 1-1, Tokushima 770-8502, Japan
推荐引用方式 GB/T 7714	Liu,Junhao,Qiu,Keping,Berry,David,et al. The JCMT BISTRO Survey: The Magnetic Field in the Starless Core ρ Ophiuchus C[J]. The Astrophysical Journal,2019,877(1):43.
APA	Liu,Junhao.,Qiu,Keping.,Berry,David.,Di Francesco,James.,Bastien,Pierre.,...&Zenko,Tetsuya.(2019).The JCMT BISTRO Survey: The Magnetic Field in the Starless Core ρ Ophiuchus C.The Astrophysical Journal,877(1),43.
MLA	Liu,Junhao,et al."The JCMT BISTRO Survey: The Magnetic Field in the Starless Core ρ Ophiuchus C".The Astrophysical Journal 877.1(2019):43.