JCMT POL-2 and BISTRO Survey Observations of Magnetic Fields in the L1689 Molecular Cloud
文献类型：期刊论文
| 作者 | Pattle,Kate10,11; Lai,Shih-Ping11,12; Di Francesco,James13,26; Sadavoy,Sarah27; Ward-Thompson,Derek28; Johnstone,Doug13,26; Hoang,Thiem2,3; Arzoumanian,Doris4; Bastien,Pierre5; Bourke,Tyler L.6,8 |
| 刊名 | The Astrophysical Journal
 |
| 出版日期 | 2021-02-01 |
| 卷号 | 907期号:2 |
| ISSN号 | 0004-637X |
| 关键词 | Star formation Interstellar magnetic fields Molecular clouds Interstellar medium Polarimetry Submillimeter astronomy Star-forming regions |
| DOI | 10.3847/1538-4357/abcc6c |
| 英文摘要 | Abstract We present 850 μm polarization observations of the L1689 molecular cloud, part of the nearby Ophiuchus molecular cloud complex, taken with the POL-2 polarimeter on the James Clerk Maxwell Telescope (JCMT). We observe three regions of L1689: the clump L1689N which houses the IRAS 16293-2433 protostellar system, the starless clump SMM-16, and the starless core L1689B. We use the Davis–Chandrasekhar–Fermi method to estimate plane-of-sky field strengths of 366?±?55 μG in L1689N, 284?±?34 μG in SMM-16, and 72?±?33 μG in L1689B, for our fiducial value of dust opacity. These values indicate that all three regions are likely to be magnetically transcritical with sub-Alfvénic turbulence. In all three regions, the inferred mean magnetic field direction is approximately perpendicular to the local filament direction identified in Herschel Space Telescope observations. The core-scale field morphologies for L1689N and L1689B are consistent with the cloud-scale field morphology measured by the Planck Space Observatory, suggesting that material can flow freely from large to small scales for these sources. Based on these magnetic field measurements, we posit that accretion from the cloud onto L1689N and L1689B may be magnetically regulated. However, in SMM-16, the clump-scale field is nearly perpendicular to the field seen on cloud scales by Planck, suggesting that it may be unable to efficiently accrete further material from its surroundings. |
| 语种 | 英语 |
| 出版者 | The American Astronomical Society |
| WOS记录号 | IOP:0004-637X-907-2-ABCC6C |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/60367]  |
| 专题 | 中国科学院国家天文台 |
| 通讯作者 | Pattle,Kate |
| 作者单位 | 1.SOFIA Science Center, Universities Space Research Association, NASA Ames Research Center, Moffett Field, CA 94035, USA 2.Korea Astronomy and Space Science Institute, 776 Daedeokdae-ro, Yuseong-gu, Daejeon 34055, Republic of Korea 3.University of Science and Technology, Korea, 217 Gajeong-ro, Yuseong-gu, Daejeon 34113, Republic of Korea 4.Instituto de Astrofísica e Ciências do Espa?o, Universidade do Porto, CAUP, Rua das Estrelas, PT4150-762 Porto, Portugal 5.Centre de recherche en astrophysique du Québec & département de physique, Université de Montréal, C.P. 6128 Succ. Centre-ville, Montréal, QC H3C 3J7, Canada 6.SKA Organisation, Jodrell Bank, Lower Withington, Macclesfield SK11 9FT, UK 7.CAS Key Laboratory of FAST, National Astronomical Observatories, Chinese Academy of Sciences, People’s Republic of China 8.Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, University of Manchester, Manchester M13 9PL, UK 9.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 10.Centre for Astronomy, National University of Ireland Galway, University Road, Galway, Ireland; katherine.pattle@nuigalway.ie |
| 推荐引用方式 GB/T 7714 | Pattle,Kate,Lai,Shih-Ping,Di Francesco,James,et al. JCMT POL-2 and BISTRO Survey Observations of Magnetic Fields in the L1689 Molecular Cloud[J]. The Astrophysical Journal,2021,907(2). |
| APA | Pattle,Kate.,Lai,Shih-Ping.,Di Francesco,James.,Sadavoy,Sarah.,Ward-Thompson,Derek.,...&Tang,Xindi.(2021).JCMT POL-2 and BISTRO Survey Observations of Magnetic Fields in the L1689 Molecular Cloud.The Astrophysical Journal,907(2). |
| MLA | Pattle,Kate,et al."JCMT POL-2 and BISTRO Survey Observations of Magnetic Fields in the L1689 Molecular Cloud".The Astrophysical Journal 907.2(2021). |
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来源：国家天文台
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