On Constraining the Growth History of Massive Black Holes via Their Distribution on the Spin–Mass Plane
文献类型：期刊论文
| 作者 | Zhang,Xiaoxia1,2,3; Lu,Youjun2,3
|
| 刊名 | The Astrophysical Journal
 |
| 出版日期 | 2019-03-08 |
| 卷号 | 873期号:2 |
| 关键词 | accretion, accretion disks black hole physics galaxies: active galaxies: nuclei relativistic processes |
| ISSN号 | 0004-637X |
| DOI | 10.3847/1538-4357/ab06c6 |
| 英文摘要 | Abstract 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. |
| 语种 | 英语 |
| WOS记录号 | IOP:0004-637X-873-2-AB06C6 |
| 出版者 | The American Astronomical Society |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/31043]  |
| 专题 | 中国科学院国家天文台 |
| 作者单位 | 1.Department of Astronomy, Xiamen University, Xiamen, Fujian 361005, People’s Republic of China 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.National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, People’s Republic of China; luyj@nao.cas.cn |
| 推荐引用方式 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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来源：国家天文台
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