Cosmic Distributions of Stellar Tidal Disruptions by Massive Black Holes at Galactic Centers
Chen,Yunfeng1; Yu,Qingjuan1; Lu,Youjun2,3
Source PublicationThe Astrophysical Journal
AbstractAbstract Stars can be consumed (either tidally disrupted or swallowed whole) by massive black holes (MBHs) at galactic centers when they move into the vicinity of the MBHs. In this study, we investigate the rates of stellar consumption by central MBHs and their cosmic distributions, including the effects of triaxial galaxy shapes in enhancing the reservoir of low-angular-momentum stars and incorporating realistic galaxy distributions. We find that the enhancement in the stellar consumption rates due to triaxial galaxy shapes can be significant, by a factor of ~3 for MBH mass – and up to more than one order of magnitude for . Only for are the stellar consumption rates significantly higher in galaxies with steeper inner surface brightness profiles. The average (per galaxy) stellar consumption rates correlate with central MBH masses positively for and negatively for . The volumetric stellar tidal disruption rates are for MBHs in the mass range 105– at z?=?0; and the volumetric stellar consumption rates by MBHs with higher masses are , which can be the stellar tidal disruption rate if the high-mass BHs are extremely spinning Kerr BHs or the rate of being swallowed if those BHs are Schwarzschild ones. The volumetric stellar consumption rates decrease with increasing redshift, and the decrease is relatively mild for – and stronger for higher . Most of the stellar tidal disruption events (TDEs) at z?=?0 occur in galaxies with mass , and about 1%–2% of the TDEs can occur in high-mass galaxies with .
KeywordAstrodynamics Galaxy dynamics Gravitational wave astronomy High energy astrophysics Supermassive black holes Tidal disruption Transient sources Time domain astronomy
WOS IDIOP:0004-637X-900-2-aba950
PublisherThe American Astronomical Society
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Document Type期刊论文
Corresponding AuthorYu,Qingjuan
Affiliation1.Kavli Institute for Astronomy and Astrophysics, and School of Physics, Peking University, Beijing, 100871, People's Republic of China;
2.National Astronomical Observatories, Chinese Academy of Sciences, Beijing, 100012, People's Republic of China
3.School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China
Recommended Citation
GB/T 7714
Chen,Yunfeng,Yu,Qingjuan,Lu,Youjun. Cosmic Distributions of Stellar Tidal Disruptions by Massive Black Holes at Galactic Centers[J]. The Astrophysical Journal,2020,900(2).
APA Chen,Yunfeng,Yu,Qingjuan,&Lu,Youjun.(2020).Cosmic Distributions of Stellar Tidal Disruptions by Massive Black Holes at Galactic Centers.The Astrophysical Journal,900(2).
MLA Chen,Yunfeng,et al."Cosmic Distributions of Stellar Tidal Disruptions by Massive Black Holes at Galactic Centers".The Astrophysical Journal 900.2(2020).
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