期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 476, 期 3, 页码 4224-4233出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/sty459
关键词
accretion, accretion discs; stars: kinematics and dynamics; galaxies: active; galaxies: nuclei; quasars: supermassive black holes
资金
- Ministry of Education and Science of the Republic of Kazakhstan [BR05236322]
- European Research Council under the European Union's Horizon Programme, ERC-2014-STG [GalNUC 638435]
- Volkswagen Foundation under the project 'STARDISK - Simulating Dense Star-Gas Systems in Galactic Nuclei using special hardware' [I/81 396]
- project 'GRACE 2: Scientific simulations using programmable hardware' of the Volkswagen Foundation [I84678/84680]
- Chinese Academy of Sciences [XDB23040100]
- Volkswagen Foundation under the Trilateral Partnerships [90411]
- Ministry of Finance of Peoples Republic of China [ZDYZ2008-2]
- Julich Supercomputing Centre (JSC) [HHD28]
- Chinese Academy of Sciences through the Silk Road Project at NAOC
- Chinese Academy of Sciences through the 'Qianren' special foreign experts program
- Chinese Academy of Sciences under the President's International Fellowship for Visiting Scientists program of CAS
- Excellence Initiative at the University of Heidelberg
We perform high-resolution direct N-body simulations to study the effect of an accretion disc on stellar dynamics in an active galactic nucleus (AGN). We show that the interaction of the nuclear stellar cluster (NSC) with the gaseous accretion disc (AD) leads to formation of a stellar disc in the central part of the NSC. The accretion of stars from the stellar disc on to the super-massive black hole is balanced by the capture of stars from the NSC into the stellar disc, yielding a stationary density profile. We derive the migration time through the AD to be 3 per cent of the half-mass relaxation time of the NSC. The mass and size of the stellar disc are 0.7 per cent of the mass and 5 per cent of the influence radius of the super-massive black hole. An AD lifetime shorter than the migration time would result in a less massive nuclear stellar disc. The detection of such a stellar disc could point to past activity of the hosting galactic nucleus.
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