The power of the jets accelerated by the coronal magnetic field
文献类型：期刊论文
| 作者 | Cao, Xinwu1,2,3 |
| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
 |
| 出版日期 | 2018 |
| 卷号 | 473期号:3页码:4268-4271 |
| 关键词 | accretion accretion discs black hole physics magnetic fields galaxies: jets quasars: general |
| ISSN号 | 0035-8711 |
| DOI | 10.1093/mnras/stx2688 |
| 通讯作者 | Cao, Xinwu(cxw@shao.ac.cn) |
| 英文摘要 | It was suggested that the large-scale magnetic field can be dragged inwards efficiently by the corona above the disc, i.e. the so-called 'coronal mechanism', which provides a way to solve the difficulty of field advection in a geometrically thin accretion disc. In this case, themagnetic pressure should be lower than the gas pressure in the corona. We estimate the maximal power of the jets accelerated by the magnetic field advected by the corona. The Blandford-Payne (BP) jet power is found always to be higher than the Blandford-Znajek (BZ) jet power, except for a rapidly spinning black hole with a greater than or similar to 0.8. The maximal jet power is always low, less than 0.05 Eddington luminosity, even for an extreme Kerr black hole, which is insufficient for the observed strong jets in some blazars with jet power similar to 0.1-1 Eddington luminosity (or even higher). It implies that these powerful jets cannot be accelerated by the coronal field. We suggest that, the magnetic field dragged inward by the accretion disc with magnetically outflows may accelerate the jets (at least for the most powerful jets, if not all) in the blazars. |
| WOS关键词 | ADVECTION-DOMINATED ACCRETION ; ACTIVE GALACTIC NUCLEI ; KERR BLACK-HOLES ; X-RAY-SPECTRA ; ELECTROMAGNETIC EXTRACTION ; DIFFUSION-COEFFICIENTS ; VERTICAL STRUCTURE ; COLLAPSING STAR ; PRANDTL NUMBER ; POLOIDAL FLUX |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000423809400103 |
| 出版者 | OXFORD UNIV PRESS |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/22259]  |
| 专题 | 中国科学院紫金山天文台 |
| 通讯作者 | Cao, Xinwu |
| 作者单位 | 1.Chinese Acad Sci, Shanghai Astron Observ, 80 Nandan Rd, Shanghai 200030, Peoples R China 2.Chinese Acad Sci, Key Lab Radio Astron, Nanjing 210008, Jiangsu, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Cao, Xinwu. The power of the jets accelerated by the coronal magnetic field[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2018,473(3):4268-4271. |
| APA | Cao, Xinwu.(2018).The power of the jets accelerated by the coronal magnetic field.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,473(3),4268-4271. |
| MLA | Cao, Xinwu."The power of the jets accelerated by the coronal magnetic field".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 473.3(2018):4268-4271. |
入库方式： OAI收割
来源：紫金山天文台
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