A limit relation between black hole mass and H beta width: Testing super-Eddington accretion in active galactic nuclei
Wang JM(王建民); Wang, JM
刊名ASTRONOMICAL JOURNAL
2003
卷号125期号:6页码:2859-2864
关键词cosmology : miscellaneous galaxies : active
学科分类Astronomy & Astrophysics
DOI10.1086/374948
通讯作者Univ Tubingen, Inst Astron & Astrophys, Abt Astron, D-72076 Tubingen, Germany ; Chinese Acad Sci, Inst High Energy Phys, High Energy Astrophys Lab, Beijing 100039, Peoples R China
文章类型Article
英文摘要We show that there is a limit relation between the black hole mass (M-BH) and the width at half-maximum (v(FWHM)) of Hbeta for active galactic nuclei (AGNs) with super-Eddington accretion rates. When a black hole has a super-Eddington accretion rate, the empirical relation derived from reverberation mapping can be applied in two possible ways. First, it reduces to a relation between the black hole mass and the size of the broad-line region because of photon-trapping effects inside the accretion disk. For the empirical reverberation relation of Kaspi et al., we obtain the limit relation M-BH=(2.9-12.6)x10(6) [v(FWHM)/(10(3) km s(-1))](6.67) M-circle dot, called the Eddington limit. Second, the Eddington limit luminosity will be relaxed if the trapped photons can escape from the magnetized super-Eddington accretion disk via the photon bubble instability, and the size of the broad-line region will be enlarged according to the empirical reverberation relation, leading to a relatively narrow Hbeta width. We call this the Begelman limit. Using this limit relation, we searched 164 AGNs for super-Eddington accretion. We find that most of them are well confined by the Eddington limit relation that is, most have sub-Eddington accretion rates-but there are a handful of objects located between the Eddington and Begelman limit lines; they may be candidate super-Eddington accretors in a hybrid structure of photon trapping and photon bubble instability. The maximum Hbeta width is in the range (3.0-3.8)x10(3) km s(-1) for the most massive black holes with super-Eddington accretion rates among AGNs. We suggest that the FWHM(Hbeta)-M-BH relation is a reliable and convenient method to test whether a source is super-Eddington and useful to probe the structure of the super-Eddington accretion process.
类目[WOS]Astronomy & Astrophysics
研究领域[WOS]Astronomy & Astrophysics
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语种英语
WOS记录号WOS:000183234100007
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被引频次:11[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/311005/239832
专题中国科学院高能物理研究所_粒子天体物理中心_期刊论文
作者单位中国科学院高能物理研究所
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Wang JM,Wang, JM. A limit relation between black hole mass and H beta width: Testing super-Eddington accretion in active galactic nuclei[J]. ASTRONOMICAL JOURNAL,2003,125(6):2859-2864.
APA 王建民,&Wang, JM.(2003).A limit relation between black hole mass and H beta width: Testing super-Eddington accretion in active galactic nuclei.ASTRONOMICAL JOURNAL,125(6),2859-2864.
MLA 王建民,et al."A limit relation between black hole mass and H beta width: Testing super-Eddington accretion in active galactic nuclei".ASTRONOMICAL JOURNAL 125.6(2003):2859-2864.
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