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On Constraining the Growth History of Massive Black Holes via Their Distribution on the Spin–Mass Plane
Zhang,Xiaoxia1,2,3; Lu,Youjun1,2
2019-03-08
Source PublicationThe Astrophysical Journal
ISSN0004-637X
Volume873Issue:2
AbstractAbstract The spin distribution of massive black holes (MBHs) contains rich information on the MBH growth history. In this paper, we investigate the spin evolution of MBHs by assuming that each MBH experiences two-phase accretion, with an initial phase of coherent accretion via either the standard thin disk or super-Eddington disk, followed by a chaotic-accretion phase composed of many episodes with different disk orientations. If the chaotic-accretion phase is significant to the growth of an MBH, the MBH spin quickly reaches the maximum value because of the initial coherent accretion, then changes to a quasi-equilibrium state and fluctuates around a value mainly determined by the mean ratio of the disk to the MBH mass (M?) in the chaotic-accretion episodes, and further declines because of late chaotic accretion if . The turning point to this decline is determined by the equality of the disk warp radius and disk size. By matching the currently available spin measurements with mock samples generated from the two-phase model(s) on the spin–mass plane, we find that MBHs must experience significant chaotic-accretion phase with many episodes and that the mass accreted in each episode is roughly 1%–2% of M? or less. MBHs with appear to have intermediate-to-high spins (~0.5–1), while lighter MBHs have higher spins (?0.8). The best matches also infer that (1) the radiative efficiencies (η) of those active MBHs appear to slightly decrease with M?; however, the correlation between η and M?, if any, is weak; (2) the mean radiative efficiency of active MBHs is , consistent with the global constraints.
Keywordaccretion, accretion disks black hole physics galaxies: active galaxies: nuclei relativistic processes
DOI10.3847/1538-4357/ab06c6
Language英语
WOS IDIOP:0004-637X-873-2-ab06c6
PublisherThe American Astronomical Society
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/31044
Collection中国科学院国家天文台
Affiliation1.National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, People’s Republic of China; luyj@nao.cas.cn
2.School of Astronomy and Space Sciences, University of Chinese Academy of Sciences, No. 19A Yuquan Road, Beijing 100049, People’s Republic of China
3.Department of Astronomy, Xiamen University, Xiamen, Fujian 361005, People’s Republic of China
First Author AffilicationNational Astronomical Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Zhang,Xiaoxia,Lu,Youjun. On Constraining the Growth History of Massive Black Holes via Their Distribution on the Spin–Mass Plane[J]. The Astrophysical Journal,2019,873(2).
APA Zhang,Xiaoxia,&Lu,Youjun.(2019).On Constraining the Growth History of Massive Black Holes via Their Distribution on the Spin–Mass Plane.The Astrophysical Journal,873(2).
MLA Zhang,Xiaoxia,et al."On Constraining the Growth History of Massive Black Holes via Their Distribution on the Spin–Mass Plane".The Astrophysical Journal 873.2(2019).
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