Magnetic Fields toward Ophiuchus-B Derived from SCUBA-2 Polarization Measurements

doi:10.3847/1538-4357/aac4a6

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	Magnetic Fields toward Ophiuchus-B Derived from SCUBA-2 Polarization Measurements
	Soam,Archana 41; Pattle,Kate 42,43,44; Ward-Thompson,Derek 42; Lee,Chang Won 41,45; Sadavoy,Sarah 46; Koch,Patrick M.47; Kim,Gwanjeong 41,45,48; Kwon,Jungmi 49; Kwon,Woojin 41,45; Arzoumanian,Doris 50
刊名	The Astrophysical Journal
	2018-07-03
卷号	861 期号:1
关键词	ISM: individual objects (Ophiuchus) ISM: structure polarization radio continuum: ISM stars: formation
ISSN号	0004-637X
DOI	10.3847/1538-4357/aac4a6
英文摘要	Abstract We present the results of dust emission polarization measurements of Ophiuchus-B (Oph-B) carried out using the Submillimetre Common-User Bolometer Array 2 (SCUBA-2) camera with its associated polarimeter (POL-2) on the James Clerk Maxwell Telescope in Hawaii. This work is part of the B-fields in Star-forming Region Observations survey initiated to understand the role of magnetic fields in star formation for nearby star-forming molecular clouds. We present a first look at the geometry and strength of magnetic fields in Oph-B. The field geometry is traced over ～0.2 pc, with clear detection of both of the sub-clumps of Oph-B. The field pattern appears significantly disordered in sub-clump Oph-B1. The field geometry in Oph-B2 is more ordered, with a tendency to be along the major axis of the clump, parallel to the filamentary structure within which it lies. The degree of polarization decreases systematically toward the dense core material in the two sub-clumps. The field lines in the lower density material along the periphery are smoothly joined to the large-scale magnetic fields probed by NIR polarization observations. We estimated a magnetic field strength of 630 ± 410 μG in the Oph-B2 sub-clump using a Davis–Chandrasekhar–Fermi analysis. With this magnetic field strength, we find a mass-to-flux ratio λ?=?1.6 ± 1.1, which suggests that the Oph-B2 clump is slightly magnetically supercritical.
语种	英语
出版者	The American Astronomical Society
WOS记录号	IOP:0004-637X-861-1-AAC4A6
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/35469]
专题	中国科学院国家天文台
作者单位	1.Department of Physics, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong 2.School of Physics and Astronomy, Cardiff University, The Parade, Cardiff, CF24 3AA, UK 3.Department of Astronomy and Space Science, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, Republic of Korea 4.Department of Physics and Astronomy, The University of Western Ontario, 1151 Richmond Street, London N6A 3K7, Canada 5.Department of Earth Science and Astronomy, Graduate School of Arts and Sciences, The University of Tokyo, 3-8-1 Komaba, Meguro, Tokyo 153-8902, Japan 6.Kagawa University, Saiwai-cho 1-1, Takamatsu, Kagawa, 760-8522, Japan 7.Subaru Telescope, National Astronomical Observatory of Japan, 650 N. A‘ohōkū Place, Hilo, HI 96720, USA 8.Hiroshima Astrophysical Science Center, Hiroshima University, Kagamiyama 1-3-1, Higashi-Hiroshima, Hiroshima 739-8526, Japan 9.Department of Physics, Hiroshima University, Kagamiyama 1-3-1, Higashi-Hiroshima, Hiroshima 739-8526, Japan 10.Core Research for Energetic Universe (CORE-U), Hiroshima University, Kagamiyama 1-3-1, Higashi-Hiroshima, Hiroshima 739-8526, Japan
推荐引用方式 GB/T 7714	Soam,Archana,Pattle,Kate,Ward-Thompson,Derek,et al. Magnetic Fields toward Ophiuchus-B Derived from SCUBA-2 Polarization Measurements[J]. The Astrophysical Journal,2018,861(1).
APA	Soam,Archana.,Pattle,Kate.,Ward-Thompson,Derek.,Lee,Chang Won.,Sadavoy,Sarah.,...&Zenko,Tetsuya.(2018).Magnetic Fields toward Ophiuchus-B Derived from SCUBA-2 Polarization Measurements.The Astrophysical Journal,861(1).
MLA	Soam,Archana,et al."Magnetic Fields toward Ophiuchus-B Derived from SCUBA-2 Polarization Measurements".The Astrophysical Journal 861.1(2018).