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Accretion rates of stellar-mass compact objects embedded in AGN discs

文献类型：期刊论文

作者Jiao CL(焦承亮)1,2,3; Zhu LY(朱俐颖)1,3,4; Zhao EG(赵二刚)1,3; Zhang J(张嘉)1,3
刊名MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
出版日期2025-12
卷号544期号:2页码:2024-2037
关键词accretion, accretion discs stars: black holes galaxies: active quasars: supermassive black holes
ISSN号0035-8711
DOI10.1093/mnras/staf1899
产权排序第1完成单位
文献子类Article
英文摘要Stellar-mass compact objects (COs) embedded in active galactic nucleus (AGN) discs are commonly assumed to accrete via Bondi or Bondi-Hoyle-Lyttleton (BHL) prescriptions, neglecting gas angular momentum. We show that differential rotation in AGN discs can impart non-negligible angular momentum, in which case accretion proceeds through a viscous disc rather than Bondi/BHL flow. Our model provides a new framework estimating the CO accretion rate as where the viscous rate M-CO(center dot) = min {M-vis(center dot), M-BHL (center dot)} M(vis )(center dot)accounts for gas-CO relative motion decomposed into a local gradient term (due to differential rotation) and bulk motion (from differing orbital parameters). This rate can be expressed as M-vis(center dot) = alpha (r(H) /r(BHL))M-3(BHL)center dot, where xi is a coefficient of the order of unity. It can also be approximately scaled to the global AGN accretion rate as M-vis (center dot)proportional to M-1(center dot), with the scaling coefficients in both forms determined by the specific dynamical configuration. The accretion is viscosity-limited when q > [alpha xi (1 + M-2)(3)/3](1/2)h(3), where q is the mass ratio between the CO and the supermassive black hole, alpha the viscosity parameter, M the Mach number of the bulk relative motion, and h the aspect ratio of the AGN disc. In thin AGN discs this condition is satisfied for most stellar-mass or more massive COs. Our framework also naturally allows for the inclusion of established outflow corrections, thereby enabling a more realistic treatment of super-Eddington flows. Our formulation thus improves upon Bondi/BHL prescriptions and offers a more physically motivated basis for studying CO evolution in AGN environments.
学科主题天文学 ; 天体物理学 ; 高能天体物理学 ; 星系与宇宙学
URL标识查看原文
出版地GREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND
WOS关键词BLACK-HOLE ACCRETION ; ACTIVE GALACTIC NUCLEI ; SUPER-EDDINGTON ACCRETION ; RADIATION MAGNETOHYDRODYNAMIC SIMULATION ; ADVECTION-DOMINATED ACCRETION ; SUPERCRITICAL ACCRETION ; NUMERICAL SIMULATIONS ; MODIFIED STARS ; DISKS ; EVOLUTION
资助项目Science Foundation of Yunnan Province[202401AS070046]; Science Foundation of Yunnan Province[202503AP140013]; International Partnership Program of the Chinese Academy of Sciences[020GJHZ2023030GC]; Yunnan Revitalization Talent Support Program
WOS研究方向Astronomy & Astrophysics
语种英语
WOS记录号WOS:001617348700001
出版者OXFORD UNIV PRESS
资助机构Science Foundation of Yunnan Province[202401AS070046, 202503AP140013] ; International Partnership Program of the Chinese Academy of Sciences[020GJHZ2023030GC] ; Yunnan Revitalization Talent Support Program
版本出版稿
源URL[http://ir.ynao.ac.cn/handle/114a53/28725]  
专题云南天文台_双星与变星研究组
通讯作者Jiao CL(焦承亮)
作者单位1.Yunnan Observatories, Chinese Academy of Sciences, 396 Yangfangwang, Guandu District, Kunming 650216, P. R. China;
2.Center for Astronomical Mega-Science, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, Beijing 100012, P. R. China;
3.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, 396 Yangfangwang, Guandu District, Kunming 650216, P. R. China;
4.University of Chinese Academy of Sciences, No. 1 Yanqihu East Road, Huairou District, 101408 Beijing, P. R. China
推荐引用方式
GB/T 7714		 Jiao CL,Zhu LY,Zhao EG,et al. Accretion rates of stellar-mass compact objects embedded in AGN discs[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2025,544(2):2024-2037.
APA 焦承亮,朱俐颖,赵二刚,&张嘉.(2025).Accretion rates of stellar-mass compact objects embedded in AGN discs.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,544(2),2024-2037.
MLA 焦承亮,et al."Accretion rates of stellar-mass compact objects embedded in AGN discs".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 544.2(2025):2024-2037.

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来源：云南天文台

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