The JCMT BISTRO Survey: Alignment between Outflows and Magnetic Fields in Dense Cores/Clumps
文献类型：期刊论文
| 作者 | Yen,Hsi-Wei23; Koch,Patrick M.23; Hull,Charles L. H.24,25; Ward-Thompson,Derek26; Bastien,Pierre27; Hasegawa,Tetsuo28; Kwon,Woojin29,30; Lai,Shih-Ping23,31; Qiu,Keping32,33; Ching,Tao-Chung10,11 |
| 刊名 | The Astrophysical Journal
 |
| 出版日期 | 2021 |
| 卷号 | 907期号:1 |
| 关键词 | Star formation Star forming regions Protostars Interstellar magnetic fields |
| ISSN号 | 0004-637X |
| DOI | 10.3847/1538-4357/abca99 |
| 英文摘要 | Abstract We compare the directions of molecular outflows of 62 low-mass Class 0 and I protostars in nearby (<450 pc) star-forming regions with the mean orientations of the magnetic fields on 0.05–0.5 pc scales in the dense cores/clumps where they are embedded. The magnetic field orientations were measured using the JCMT POL-2 data taken by the BISTRO-1 survey and from the archive. The outflow directions were observed with interferometers in the literature. The observed distribution of the angles between the outflows and the magnetic fields peaks between 15° and 35°. After considering projection effects, our results could suggest that the outflows tend to be misaligned with the magnetic fields by 50°?±?15° in three-dimensional space and are less likely (but not ruled out) randomly oriented with respect to the magnetic fields. There is no correlation between the misalignment and the bolometric temperatures in our sample. In several sources, the small-scale (1000–3000 au) magnetic field is more misaligned with the outflow than the large-scale magnetic field, suggesting that the small-scale magnetic field has been twisted by the dynamics. In comparison with turbulent MHD simulations of core formation, our observational results are more consistent with models in which the energy densities in the magnetic field and the turbulence of the gas are comparable. Our results also suggest that the misalignment alone cannot sufficiently reduce the efficiency of magnetic braking to enable formation of the observed number of large Keplerian disks with sizes larger than 30–50 au. |
| 语种 | 英语 |
| WOS记录号 | IOP:0004-637X-907-1-ABCA99 |
| 出版者 | The American Astronomical Society |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/60933]  |
| 专题 | 中国科学院国家天文台 |
| 通讯作者 | Yen,Hsi-Wei |
| 作者单位 | 1.Institute of Liberal Arts and Sciences Tokushima University, Minami Jousanajima-machi 1-1, Tokushima 770-8502, Japan 2.Physics and Astronomy, University of Exeter, Stocker Road, Exeter EX4 4QL, UK 3.Department of Physics and Astronomy, The University of Western Ontario, 1151 Richmond Street, London N6A 3K7, Canada 4.Department of Physics, Graduate School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8602, Japan 5.National Astronomical Observatory, 2-21-1 Osawa, Mitaka-shi, Tokyo 181-8588, Japan 6.Department of Physics and Astronomy, University College London, London WC1E 6BT, UK 7.Department of Astronomy, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan 8.Xinjiang Astronomical Observatory, Chinese Academy of Sciences, 830011 Urumqi, People’s Republic of China 9.Department of Astronomy, Yunnan University, Kunming, 650091, People’s Republic of China 10.CAS Key Laboratory of FAST, National Astronomical Observatories, Chinese Academy of Sciences, People’s Republic of China |
| 推荐引用方式 GB/T 7714 | Yen,Hsi-Wei,Koch,Patrick M.,Hull,Charles L. H.,et al. The JCMT BISTRO Survey: Alignment between Outflows and Magnetic Fields in Dense Cores/Clumps[J]. The Astrophysical Journal,2021,907(1). |
| APA | Yen,Hsi-Wei.,Koch,Patrick M..,Hull,Charles L. H..,Ward-Thompson,Derek.,Bastien,Pierre.,...&Zhang,Chuan-Peng.(2021).The JCMT BISTRO Survey: Alignment between Outflows and Magnetic Fields in Dense Cores/Clumps.The Astrophysical Journal,907(1). |
| MLA | Yen,Hsi-Wei,et al."The JCMT BISTRO Survey: Alignment between Outflows and Magnetic Fields in Dense Cores/Clumps".The Astrophysical Journal 907.1(2021). |
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来源：国家天文台
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