The Large-scale Magnetic Field of a Thin Accretion Disk with Outflows
文献类型：期刊论文
| 作者 | Li,Jiawen2,4; Cao,Xinwu1,3,4 |
| 刊名 | The Astrophysical Journal
 |
| 出版日期 | 2019-02-20 |
| 卷号 | 872期号:2 |
| ISSN号 | 0004-637X |
| 关键词 | accretion, accretion disks galaxies: jets ISM: jets and outflows magnetic fields |
| DOI | 10.3847/1538-4357/ab0207 |
| 英文摘要 | Abstract The large-scale magnetic field threading an accretion disk plays an important role in launching jets/outflows. The field may probably be advected inward by the plasma in the accretion disk from the ambient environment (interstellar medium or a companion star). It has been suggested that the external field can be efficiently dragged inward in a thin disk with magnetic outflows. We construct a self-consistent global disk-outflow model in which the large-scale field is formed by the advection of the external field in the disk. The outflows are accelerated by this field corotating with the disk, which carries away most of the angular momentum of the disk and causes its structure to become significantly different from the conventional viscous disk structure. We find that the magnetic field strength in the inner region of the disk can be several orders of magnitude higher than the external field strength for a geometrically thin disk with H/R?～0.1 if the ratio of the gas to magnetic pressure βout?～?102 at the outer edge of the disk. The outflow velocity shows a layer-like structure, i.e., it decreases with radius where it is launched. The outflow can be accelerated up to ～0.2–0.3c from the inner region of the disk, and the mass-loss rate in the outflows is ～10%–70% of the mass accretion rate at the outer radius of the disk, which may account for the fast outflows that are observed in some active galactic nuclei. |
| 语种 | 英语 |
| 出版者 | The American Astronomical Society |
| WOS记录号 | IOP:0004-637X-872-2-AB0207 |
| 源URL | [http://119.78.226.72/handle/331011/31939]  |
| 专题 | 中国科学院上海天文台 |
| 作者单位 | 1.Key Laboratory of Radio Astronomy, Chinese Academy of Sciences, 210008 Nanjing, People’s Republic of China 2.Key Laboratory for Research in Galaxies and Cosmology, Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80 Nandan Road, Shanghai, 200030, People’s Republic of China 3.Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80 Nandan Road, Shanghai, 200030, People’s Republic of China 4.University of Chinese Academy of Sciences, 19A Yuquan Road, 100049, Beijing, People’s Republic of China; cxw@shao.ac.cn |
| 推荐引用方式 GB/T 7714 | Li,Jiawen,Cao,Xinwu. The Large-scale Magnetic Field of a Thin Accretion Disk with Outflows[J]. The Astrophysical Journal,2019,872(2). |
| APA | Li,Jiawen,&Cao,Xinwu.(2019).The Large-scale Magnetic Field of a Thin Accretion Disk with Outflows.The Astrophysical Journal,872(2). |
| MLA | Li,Jiawen,et al."The Large-scale Magnetic Field of a Thin Accretion Disk with Outflows".The Astrophysical Journal 872.2(2019). |
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来源：上海天文台
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