Magnetic Fields toward Ophiuchus-B Derived from SCUBA-2 Polarization Measurements
文献类型：期刊论文
| 作者 | Soam,Archana1; Pattle,Kate2,3,4; Ward-Thompson,Derek2; Lee,Chang Won1,5; Sadavoy,Sarah6; Koch,Patrick M.7; Kim,Gwanjeong1,5,8; Kwon,Jungmi9; Kwon,Woojin1,5; Arzoumanian,Doris10 |
| 刊名 | The Astrophysical Journal
 |
| 出版日期 | 2018-07-03 |
| 卷号 | 861期号:1 |
| ISSN号 | 0004-637X |
| 关键词 | ISM: individual objects (Ophiuchus) ISM: structure polarization radio continuum: ISM stars: formation |
| 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 |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/23450]  |
| 专题 | 中国科学院紫金山天文台 |
| 作者单位 | 1.Korea Astronomy and Space Science Institute, 776 Daedeokdae-ro, Yuseong-gu, Daejeon 34055, Republic of Korea; archanasoam.bhu@gmail.com 2.Jeremiah Horrocks Institute, University of Central Lancashire, Preston PR1 2HE, UK 3.National Astronomical Observatory of Japan, National Institutes of Natural Sciences, Osawa, Mitaka, Tokyo 181-8588, Japan 4.Institute of Astronomy and Department of Physics, National Tsing Hua University, Hsinchu 30013, Taiwan 5.Korea University of Science and Technology, 217 Gajang-ro, Yuseong-gu, Daejeon 34113, Republic of Korea 6.Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA 7.Academia Sinica Institute of Astronomy and Astrophysics, P.O. Box 23-141, Taipei 10617, Taiwan 8.Nobeyama Radio Observatory (NRO), National Astronomical Observatory of Japan (NAOJ), Japan 9.Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, 3-1-1 Yoshinodai, Chuo-ku, Sagamihara, Kanagawa 252-5210, Japan 10.Department of Physics, Graduate School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8602, 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). |
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