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, Jihye42,43; Kim, Jongsoo42,43; Pattle, Kate41; Kwon, Woojin40,43; Sadavoy, Sarah39; Koch, Patrick M.38; Hull, Charles L. H.36,37; Johnstone, Doug34,35; Furuya, Ray S.33; Won Lee, Chang42,43 |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2021-06-01 |
| 卷号 | 913期号:2页码:20 |
| ISSN号 | 0004-637X |
| DOI | 10.3847/1538-4357/abf3c4 |
| 通讯作者 | Hwang, Jihye(hjh3772@gmail.com) |
| 英文摘要 | 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 mu m, and (CO)-O-18 (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 '' x 40 '' (5x5 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 Alfven 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 Alfven Mach number is about 0.4 over the region, which implies that the magnetic pressure exceeds the turbulent pressure in the OMC-1 region. |
| WOS关键词 | GOULD BELT SURVEY ; REGULATED STAR-FORMATION ; MOLECULAR CLOUDS ; SCUBA-2 OBSERVATIONS ; ZEEMAN OBSERVATIONS ; LEGACY SURVEY ; ORION-A ; POLARIZATION ; EVOLUTION ; COLLAPSE |
| 资助项目 | New Faculty Startup Fund from Seoul National University ; Basic Science Research Program through the National Research Foundation of Korea[NRF-2016R1C1B2013642] ; NAOJ Fellowship ; JSPS KAKENHI[18K13586] ; JSPS KAKENHI[20K14527] ; JSPS KAKENHI[19H01938] ; JSPS KAKENHI[18H05442] ; JSPS KAKENHI[15H02063] ; JSPS KAKENHI[22000005] ; JSPS KAKENHI[19K14775] ; National Research Council of Canada ; Natural Sciences and Engineering Research Council of Canada (NSERC) Discovery Grant ; Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education, Science and Technology[NRF-2019R1A2C1010851] ; Chinese academy of sciences[114231KYSB20200009] ; NSF[AST-1715876] ; Ministry of Science and Technology of Taiwan[106-2119-M-007-021-MY3] ; Ministry of Science and Technology of Taiwan[109-2112-M-007-010-MY3] ; Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education[NRF-2020R1A6A3A01100208] ; National Natural Science Foundation of China (NSFC)[U1731237] ; National Natural Science Foundation of China (NSFC)[11911530226] ; National Natural Science Foundation of China (NSFC)[11725313] ; National Key R&D Program of China[2017YFA0402700] ; Science and Technology Facilities Council of the United Kingdom |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000655553900001 |
| 出版者 | IOP PUBLISHING LTD |
| 资助机构 | New Faculty Startup Fund from Seoul National University ; Basic Science Research Program through the National Research Foundation of Korea ; NAOJ Fellowship ; JSPS KAKENHI ; National Research Council of Canada ; Natural Sciences and Engineering Research Council of Canada (NSERC) Discovery Grant ; Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education, Science and Technology ; Chinese academy of sciences ; NSF ; Ministry of Science and Technology of Taiwan ; Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education ; National Natural Science Foundation of China (NSFC) ; National Key R&D Program of China ; Science and Technology Facilities Council of the United Kingdom |
| 源URL | [http://ir.xao.ac.cn/handle/45760611-7/4203]  |
| 专题 | 恒星形成与演化研究团组 |
| 通讯作者 | Hwang, Jihye |
| 作者单位 | 1.Univ Montreal, Dept Phys, 1375 Ave Therese Lavoie Roux, Montreal, PQ H2V 0B3, Canada 2.Univ Montreal, Ctr Rech Astrophys Quebec, 1375 Ave Therese Lavoie Roux, Montreal, PQ H2V 0B3, Canada 3.Natl Tsing Hua Univ, Dept Phys, 101,Sec 2,Guangfu Rd, Hsinchu 30013, Taiwan 4.Natl Tsing Hua Univ, Inst Astron, 101,Sec 2,Guangfu Rd, Hsinchu 30013, Taiwan 5.Nanjing Univ, Minist Educ, Key Lab Modern Astron & Astrophys, Nanjing 210023, Peoples R China 6.Nanjing Univ, Sch Astron & Space Sci, 163 Xianlin Ave, Nanjing 210023, Peoples R China 7.Natl Inst Nat Sci, Natl Astron Observ Japan, Mitaka, Tokyo 1818588, Japan 8.Univ KwaZulu Natal, NAOC UKZN Computat Astrophys Ctr, ZA-4000 Durban, South Africa 9.Chinese Acad Sci, Natl Astron Observ, A20 Datun Rd, Beijing 100012, Peoples R China 10.Univ Cent Lancashire, Jeremiah Horrocks Inst, Preston PR1 2HE, Lancs, England |
| 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]. ASTROPHYSICAL JOURNAL,2021,913(2):20. |
| 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.ASTROPHYSICAL JOURNAL,913(2),20. |
| MLA | Hwang, Jihye,et al."The JCMT BISTRO Survey: The Distribution of Magnetic Field Strengths toward the OMC-1 Region".ASTROPHYSICAL JOURNAL 913.2(2021):20. |
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