The JCMT BISTRO Survey: The Magnetic Field in the Starless Core ρ Ophiuchus C
文献类型：期刊论文
| 作者 | Liu,Junhao63,64,65; Qiu,Keping64,65; Berry,David62; Di Francesco,James60,61; Bastien,Pierre58,59; Koch,Patrick M.57; Furuya,Ray S.55,56; Kim,Kee-Tae54; Coudé,Simon53,58; Lee,Chang Won52,54 |
| 刊名 | The Astrophysical Journal
 |
| 出版日期 | 2019-05-22 |
| 卷号 | 877期号:1 |
| ISSN号 | 0004-637X |
| 关键词 | ISM: individual objects (Ophiuchus) magnetic fields polarization stars: formation |
| DOI | 10.3847/1538-4357/ab0958 |
| 英文摘要 | Abstract 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 | IOP:0004-637X-877-1-AB0958 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/28878]  |
| 专题 | 中国科学院国家天文台 |
| 作者单位 | 1.European Southern Observatory (ESO), Karl-Schwarzschild-Strasse 2, D-85748 Garching, Germany 2.Astrobiology Center, National Institutes of Natural Sciences, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan 3.Department of Physics and Astronomy, Graduate School of Science and Engineering, Kagoshima University, 1-21-35 Korimoto, Kagoshima, Kagoshima 890-0065, Japan 4.Department of Physics, School of Science and Technology, Kwansei Gakuin University, 2-1 Gakuen, Sanda, Hyogo 669-1337, Japan 5.OSL, Physics & Astronomy Dept., University College London, WC1E 6BT London, UK 6.Department of Astronomy and Earth Sciences, Tokyo Gakugei University, Koganei, Tokyo 184-8501, Japan 7.Kavli Institute for Cosmology, Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge, CB3 0HA, UK 8.Astrophysics Group, Cavendish Laboratory, J. J. Thomson Avenue, Cambridge CB3 0HE, UK 9.Department of Physics and Astronomy, Graduate School of Science and Engineering, Kagoshima University, 1-21-35 Korimoto, Kagoshima, Kagoshima 890-0065, Japan 10.SOKENDAI (The Graduate University for Advanced Studies), Hayama, Kanagawa 240-0193, 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). |
| 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). |
| 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). |
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来源：国家天文台
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