What is the real accretion rate on to a black hole for low-angular-momentum accretion?

doi:10.1093/mnras/stz050

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	What is the real accretion rate on to a black hole for low-angular-momentum accretion?
	Bu, De-Fu1 ; Yang, Xiao-Hong 2
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2019-04-01
卷号	484 期号:2 页码:1724-1734
关键词	accretion, accretion discs black hole physics hydrodynamics galaxies: active galaxies: nuclei
ISSN号	0035-8711
DOI	10.1093/mnras/stz050
英文摘要	The mass-accretion rate is a key parameter in accretion disc theory, determining the accretion mode of black holes. In large-scale cosmological simulations of galaxy formation and evolution, the Bondi radius can be at most marginally resolved. In these simulations, the Bondi accretion formula is always used to estimate the black hole accretion rate. The Bondi solution is too simple, however, and does not represent the real accretion process. We perform simulations at the parsec scale of a hot accretion flow irradiated by a low-luminosity active galactic nucleus (AGN). We perform 77 simulations with varying density and temperature at the outer boundary (10 parsec). Our aim is to find a formula to calculate the real black hole accretion rate based on the gas density and temperature at the parsec scale. We define the Eddington accretion rate to be M-Edd = 10 L-Edd /C-2, with L-Edd and c the Eddington luminosity and speed of light respectively, and set the black hole mass to be 10(8 )M(circle dot), where M-circle dot is the solar mass. We find that the black hole accretion rate can be expressed as M-BH/M-Edd = 10(-3.11)(rho 0 / 10(-22)g cm(-3))(1.36)( T-0/10(7) K)(-1.9), where rho 0 and T-0 are the density and temperature at the parsec scale, respectively. We find that the formula can accurately predict the luminosity of observed low-luminosity AGNs (with black hole mass similar to 10(8) M-circle dot). This formula can be used in subgrid models in large-scale cosmological simulations with a black hole mass of similar to 10(8) M-circle dot.
资助项目	Natural Science Foundation of China[11773053 11573051] ; Natural Science Foundation of China[11633006] ; Natural Science Foundation of China[11661161012] ; Natural Science Foundation of Shanghai[16ZR1442200] ; Key Research Program of Frontier Sciences of CAS[QYZDJSSW- SYS008]
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	OXFORD UNIV PRESS
WOS记录号	WOS:000462302600021
内容类型	期刊论文
源URL	[http://119.78.226.72/handle/331011/31865]
专题	中国科学院上海天文台
通讯作者	Bu, De-Fu; Yang, Xiao-Hong
作者单位	1.Chinese Acad Sci, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, 80 Nandan Rd, Shanghai 200030, Peoples R China 2.Chongqing Univ, Dept Phys, Chongqing 400044, Peoples R China
推荐引用方式 GB/T 7714	Bu, De-Fu,Yang, Xiao-Hong. What is the real accretion rate on to a black hole for low-angular-momentum accretion?[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2019,484(2):1724-1734.
APA	Bu, De-Fu,&Yang, Xiao-Hong.(2019).What is the real accretion rate on to a black hole for low-angular-momentum accretion?.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,484(2),1724-1734.
MLA	Bu, De-Fu,et al."What is the real accretion rate on to a black hole for low-angular-momentum accretion?".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 484.2(2019):1724-1734.