The JCMT BISTRO Survey: The Distribution of Magnetic Field Strengths toward the OMC-1 Region
文献类型：期刊论文
| 作者 | Hwang,Jihye3,4; Kim,Jongsoo3,4; Pattle,Kate5; Kwon,Woojin3,6; Sadavoy,Sarah7; Koch,Patrick M.8; Hull,Charles L. H.9,10; Johnstone,Doug11,12; Furuya,Ray S.13; Won Lee,Chang3,4 |
| 刊名 | The Astrophysical Journal
 |
| 出版日期 | 2021-05-27 |
| 卷号 | 913期号:2 |
| 关键词 | Dense interstellar clouds Star-forming regions Polarimetry Interstellar magnetic fields |
| ISSN号 | 0004-637X |
| DOI | 10.3847/1538-4357/abf3c4 |
| 英文摘要 | Abstract Measurement of magnetic field strengths in a molecular cloud is essential for determining the criticality of magnetic support against gravitational collapse. In this paper, as part of the JCMT BISTRO survey, we suggest a new application of the Davis–Chandrasekhar–Fermi (DCF) method to estimate the distribution of magnetic field strengths in the OMC-1 region. We use observations of dust polarization emission at 450 and 850 μm, and C18O (3–2) spectral line data obtained with the JCMT. We estimate the volume density, the velocity dispersion, and the polarization angle dispersion in a box, 40″ × 40″ (5×5 pixels), which moves over the OMC-1 region. By substituting three quantities in each box with the DCF method, we get magnetic field strengths over the OMC-1 region. We note that there are very large uncertainties in the inferred field strengths, as discussed in detail in this paper. The field strengths vary from 0.8 to 26.4 mG, and their mean value is about 6 mG. Additionally, we obtain maps of the mass-to-flux ratio in units of a critical value and the Alfvén Mach number. The central parts of the BN–KL and South (S) clumps in the OMC-1 region are magnetically supercritical, so the magnetic field cannot support the clumps against gravitational collapse. However, the outer parts of the region are magnetically subcritical. The mean Alfvén Mach number is about 0.4 over the region, which implies that the magnetic pressure exceeds the turbulent pressure in the OMC-1 region. |
| 语种 | 英语 |
| WOS记录号 | IOP:0004-637X-913-2-ABF3C4 |
| 出版者 | The American Astronomical Society |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/58608]  |
| 专题 | 中国科学院国家天文台 |
| 通讯作者 | Kim,Jongsoo |
| 作者单位 | 1.Institute for Astronomy and Department of Physics, National Tsing Hua University, No. 101, Sec. 2, Guangfu Road, Hsinchu 30013, Taiwan 2.SKA Organisation, Jodrell Bank, Lower Withington, Macclesfield, SK11 9FT, UK 3.Korea Astronomy and Space Science Institute (KASI), 776 Daedeokdae-ro, Yuseong-gu, Daejeon 34055, Republic of Korea; hjh3772@gmail.com 4.University of Science and Technology, Korea (UST), 217 Gajeong-ro, Yuseong-gu, Daejeon 34113, Republic of Korea 5.Centre for Astronomy, Department of Physics, National University of Ireland Galway, University Road, Galway H91 TK33, Ireland 6.SNU Astronomy Research Center, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea 7.Department for Physics, Engineering Physics and Astrophysics, Queen’s University, Kingston, ON, K7L 3N6, Canada 8.Academia Sinica Institute of Astronomy and Astrophysics, No. 1, Sec. 4., Roosevelt Road, Taipei 10617, Taiwan 9.National Astronomical Observatory of Japan, Alonso de Córdova 3788, Office 61B, 7630422, Vitacura, Santiago, Chile 10.Joint ALMA Observatory, Alonso de Córdova 3107, Vitacura, Santiago, Chile |
| 推荐引用方式 GB/T 7714 | Hwang,Jihye,Kim,Jongsoo,Pattle,Kate,et al. The JCMT BISTRO Survey: The Distribution of Magnetic Field Strengths toward the OMC-1 Region[J]. The Astrophysical Journal,2021,913(2). |
| APA | Hwang,Jihye.,Kim,Jongsoo.,Pattle,Kate.,Kwon,Woojin.,Sadavoy,Sarah.,...&Bastien,Pierre.(2021).The JCMT BISTRO Survey: The Distribution of Magnetic Field Strengths toward the OMC-1 Region.The Astrophysical Journal,913(2). |
| MLA | Hwang,Jihye,et al."The JCMT BISTRO Survey: The Distribution of Magnetic Field Strengths toward the OMC-1 Region".The Astrophysical Journal 913.2(2021). |
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来源：国家天文台
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