Effect of Accreting Tidally Disrupted Stars on the Spin Evolution of ~106 M⊙ Black Holes
Zhang,Xiaoxia1,2,3; Lu,Youjun1,2,4; Liu,Zhu1
Source PublicationThe Astrophysical Journal
AbstractAbstract Accretion of tidally disrupted stars (TDSs) is expected to contribute significantly to the growth of massive black holes (MBHs) with mass ~106 in galactic centers. In this paper, we quantitatively investigate the effect of the TDS accretion on the spin evolution of these relatively small MBHs, by also considering the accretion of gas clouds with (many) chaotic episodes. We find that the accretion of TDSs can play an important role or even a dominant role in shaping the spin distribution of ~106 MBHs, depending on the contribution fraction ( ) of the TDS accretion to the MBH growth. If is as large as , most MBHs have low spins ( ); if is as small as , most MBHs have high spins ( ). We also find that (1) the fraction of highly spinning ~106 MBHs in the TDS accretion states is smaller than that in the gas-cloud (active galactic nucleus [AGN]) accretion states, which is a consequence of more rapid spin decrease during the period of consecutive TDS accretion than the spin increase during the AGN periods when the spin is large; and (2) the fraction of retrograde-spin accretion in the TDS accretion states is almost the same as that of prograde-spin accretion, while it is negligible in the gas-cloud (AGN) accretion states. The current scarce sample of AGNs (~106 ) with spin measurements hints at an insignificant contribution from TDS accretion to MBH growth. Future measurements on spins of ~106 MBHs may provide stronger constraints on the importance of both AGN and TDS accretion states in their growth history.
Keywordaccretion, accretion disks black hole physics galaxies: active galaxies: nuclei relativistic processes
WOS IDIOP:0004-637X-877-2-ab1d48
PublisherThe American Astronomical Society
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Document Type期刊论文
Affiliation1.National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, 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.Department of Astronomy, Xiamen University, Xiamen, Fujian, 361005, People’s Republic of China
4.CAS key laboratory for computational Astrophysics, National Astronomic Observatories of China, Chinese Academy of Sciences, Beijing 100101, People’s Republic of China
First Author AffilicationNational Astronomical Observatories, Chinese Academy of Sciences
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GB/T 7714
Zhang,Xiaoxia,Lu,Youjun,Liu,Zhu. Effect of Accreting Tidally Disrupted Stars on the Spin Evolution of ~106 M⊙ Black Holes[J]. The Astrophysical Journal,2019,877(2).
APA Zhang,Xiaoxia,Lu,Youjun,&Liu,Zhu.(2019).Effect of Accreting Tidally Disrupted Stars on the Spin Evolution of ~106 M⊙ Black Holes.The Astrophysical Journal,877(2).
MLA Zhang,Xiaoxia,et al."Effect of Accreting Tidally Disrupted Stars on the Spin Evolution of ~106 M⊙ Black Holes".The Astrophysical Journal 877.2(2019).
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