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Ionization structure and Fe K alpha energy for irradiated accretion discs
Zhou, X. L.1,2; Zhao, Y. H.1,2; Soria, R.3
2011-05-01
发表期刊MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷号413期号:1页码:L61-L65
摘要We study the radial ionization structure at the surface of an X-ray illuminated accretion disc. We plot the expected iron K alpha line energy as a function of the Eddington ratio and of the distance of the emitting matter from the central source, for a non-rotating and a maximally rotating black hole. We compare the predicted disc line energies with those measured in an archival sample of active galactic nuclei observed with Chandra, XMM-Newton and Suzaku, and discuss whether the line energies are consistent with the radial distances inferred from reverberation studies. We also suggest using rapidly variable iron K alpha lines to estimate the viscosity parameter of an accretion disc. There is a forbidden region in the line energy versus Eddington ratio plane, at low Eddington ratios, where an accretion disc cannot produce highly ionized iron K alpha lines. If such emission is observed in low-Eddington-ratio sources, it is coming from either a highly ionized outflow or a blueshifted component from fast-moving neutral matter.
关键词Galaxies: Active Accretion Quasars: Emission Lines Accretion Discs X-rays: Galaxies
DOI10.1111/j.1745-3933.2011.01033.x
收录类别SCI
语种英语
WOS记录号WOS:000291558100014
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被引频次:2[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.bao.ac.cn/handle/114a11/7993
专题光学天文研究部
作者单位1.Chinese Acad Sci, Key Lab Opt Astron, Natl Astron Observ, Beijing 100012, Peoples R China
2.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
3.Univ Coll London, Mullard Space Sci Lab, Surrey RH5 6NT, England
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Zhou, X. L.,Zhao, Y. H.,Soria, R.. Ionization structure and Fe K alpha energy for irradiated accretion discs[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2011,413(1):L61-L65.
APA Zhou, X. L.,Zhao, Y. H.,&Soria, R..(2011).Ionization structure and Fe K alpha energy for irradiated accretion discs.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,413(1),L61-L65.
MLA Zhou, X. L.,et al."Ionization structure and Fe K alpha energy for irradiated accretion discs".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 413.1(2011):L61-L65.
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