The hot disk corona and magnetic turbulence in radio-quiet active Galactic nuclei: Observational constraints
文献类型：期刊论文
| 作者 | Wang JM(王建民) ; Wang, JM; Watarai, KY; Mineshige, S
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| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2004 |
| 卷号 | 607期号:2页码:L107-L110 |
| 关键词 | accretion, accretion disks galaxies : active galaxies : Seyfert magnetic fields |
| 通讯作者 | Kyoto Univ, Yukawa Inst Theoret Phys, Kyoto 606852, Japan ; Chinese Acad Sci, Inst High Energy Phys, High Energy Astrophys Lab, Beijing 100039, Peoples R China |
| 英文摘要 | We compile a sample consisting of 56 radio-quiet active galactic nuclei so as to investigate the statistical properties of the hot corona in accretion disks from ASCA observations. The black hole masses in the sample are estimated via several popular methods, and the bolometric luminosities from the multiwavelength continuum. This allows us to estimate the Eddington ratio (E = L-bol/L-Edd) so that the undergoing physical processes can be tested via hard X-ray data. We use the least- squares method of multivariate regression and find a strong correlation between F-X = L2-10 keV/L-bol and E as F-X proportional to E-064. This indicates that the release of gravitational energy in the hot corona is controlled by the Eddington ratio. On the other hand, the correlation between the hard X- ray spectral index (Gamma) and E depends critically on the types of objects: Gamma is nearly constant (Gamma proportional to E-0) in broad- line Seyfert 1 galaxies, whereas Gamma proportional to log E-0.18 in narrow- line Seyfert 1 galaxies, although this is not very significant. We can set constraints on the forms of the magnetic stress tensor on the condition that F-X is proportional to the fraction f of gravitational energy dissipated in the hot corona and that f is proportional to the magnetic energy density in the disk. We find that the shear stress tensor is favored by the correlation in the present sample, t. P where P-gas is the gas pressure. |
| 学科主题 | Astronomy & Astrophysics |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 原文出处 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000221540200011 |
| 源URL | [http://ir.ihep.ac.cn/handle/311005/240237]  |
| 专题 | 高能物理研究所_粒子天体物理中心 |
| 作者单位 | 中国科学院高能物理研究所 |
| 推荐引用方式 GB/T 7714 | Wang JM,Wang, JM,Watarai, KY,et al. The hot disk corona and magnetic turbulence in radio-quiet active Galactic nuclei: Observational constraints[J]. ASTROPHYSICAL JOURNAL,2004,607(2):L107-L110. |
| APA | 王建民,Wang, JM,Watarai, KY,&Mineshige, S.(2004).The hot disk corona and magnetic turbulence in radio-quiet active Galactic nuclei: Observational constraints.ASTROPHYSICAL JOURNAL,607(2),L107-L110. |
| MLA | 王建民,et al."The hot disk corona and magnetic turbulence in radio-quiet active Galactic nuclei: Observational constraints".ASTROPHYSICAL JOURNAL 607.2(2004):L107-L110. |
入库方式： OAI收割
来源：高能物理研究所
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