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The hot disk corona and magnetic turbulence in radio-quiet active Galactic nuclei: Observational constraints
Wang JM(王建民); Wang, JM; Watarai, KY; Mineshige, S
2004
发表期刊ASTROPHYSICAL JOURNAL
卷号607期号:2页码:L107-L110
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
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.
文章类型Article
关键词accretion, accretion disks galaxies : active galaxies : Seyfert magnetic fields
学科领域Astronomy & Astrophysics
DOI10.1086/421906
研究领域[WOS]Astronomy & Astrophysics
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语种英语
WOS类目Astronomy & Astrophysics
WOS记录号WOS:000221540200011
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被引频次:77[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/240237
专题粒子天体物理中心
作者单位中国科学院高能物理研究所
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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.
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