The JCMT BISTRO Survey: Evidence for Pinched Magnetic Fields in Quiescent Filaments of NGC 1333
文献类型：期刊论文
| 作者 | Doi, Y.36; Tomisaka, K.35; Hasegawa, T.35; Coude, S.33,34; Arzoumanian, D.32,35; Bastien, P.31,33; Matsumura, M.30; Tahani, M.29; Sadavoy, S.28; Hull, C. L. H.26,27 |
| 刊名 | Astrophysical Journal Letters
 |
| 出版日期 | 2021-12-01 |
| 卷号 | 923期号:1页码:12L9 |
| ISSN号 | 2041-8205 |
| 关键词 | radiative torques molecular clouds polarization equilibrium Astronomy & Astrophysics |
| DOI | 10.3847/2041-8213/ac3cc1 |
| 产权排序 | 30 |
| 文献子类 | Article |
| 英文摘要 | We investigate the internal 3D magnetic structure of dense interstellar filaments within NGC 1333 using polarization data at 850 mu m from the B-fields In STar-forming Region Observations survey at the James Clerk Maxwell Telescope. Theoretical models predict that the magnetic field lines in a filament will tend to be dragged radially inward (i.e., pinched) toward the central axis due to the filament's self-gravity. We study the cross-sectional profiles of the total intensity (I) and polarized intensity (PI) of dust emission in four segments of filaments unaffected by local star formation that are expected to retain a pristine magnetic field structure. We find that the filaments' FWHMs in PI are not the same as those in I, with two segments being appreciably narrower in PI (FWHM ratio similar or equal to 0.7-0.8) and one segment being wider (FWHM ratio similar or equal to 1.3). The filament profiles of the polarization fraction (P) do not show a minimum at the spine of the filament, which is not in line with an anticorrelation between P and I normally seen in molecular clouds and protostellar cores. Dust grain alignment variation with density cannot reproduce the observed P distribution. We demonstrate numerically that the I and PI cross-sectional profiles of filaments in magnetohydrostatic equilibrium will have differing relative widths depending on the viewing angle. The observed variations of FWHM ratios in NGC 1333 are therefore consistent with models of pinched magnetic field structures inside filaments, especially if they are magnetically near-critical or supercritical. |
| 语种 | 英语 |
| WOS记录号 | WOS:000728084600001 |
| 源URL | [http://ir.xao.ac.cn/handle/45760611-7/4709]  |
| 专题 | 恒星形成与演化研究团组 |
| 作者单位 | 1.Department of Physics, Graduate School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8602, Japan 2.Academia Sinica Institute of Astronomy and Astrophysics, No. 1, Sec. 4., Roosevelt Road, Taipei 10617, Taiwan; 3.Institute of Astronomy and Department of Physics, National Tsing Hua University, Hsinchu 30013, Taiwan; 4.Key Laboratory of Modern Astronomy and Astrophysics (Nanjing University), Ministry of Education, Nanjing 210023, People’s Republic of China; 5.School of Astronomy and Space Science, Nanjing University, 163 Xianlin Avenue, Nanjing 210023, People’s Republic of China; 6.Department of Astronomy, Yunnan University, Kunming, 650091, People’s Republic of China; 7.Xinjiang Astronomical Observatory, Chinese Academy of Sciences, 830011 Urumqi, People’s Republic of China; 8.Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, University of Manchester, Oxford Road, Manchester, M13 9PL, UK; 9.SKA Observatory, Jodrell Bank, Lower Withington, Macclesfield SK11 9FT, UK; 10.SNU Astronomy Research Center, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea; |
| 推荐引用方式 GB/T 7714 | Doi, Y.,Tomisaka, K.,Hasegawa, T.,et al. The JCMT BISTRO Survey: Evidence for Pinched Magnetic Fields in Quiescent Filaments of NGC 1333[J]. Astrophysical Journal Letters,2021,923(1):12L9. |
| APA | Doi, Y..,Tomisaka, K..,Hasegawa, T..,Coude, S..,Arzoumanian, D..,...&Lai, S. P..(2021).The JCMT BISTRO Survey: Evidence for Pinched Magnetic Fields in Quiescent Filaments of NGC 1333.Astrophysical Journal Letters,923(1),12L9. |
| MLA | Doi, Y.,et al."The JCMT BISTRO Survey: Evidence for Pinched Magnetic Fields in Quiescent Filaments of NGC 1333".Astrophysical Journal Letters 923.1(2021):12L9. |
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