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题名: Limits on luminosity and mass accretion rate of a radiation-pressure-dominated accretion disc
作者: Cao, Xinwu1, 2, 3, 4; Gu, Wei-Min3, 4
刊名: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
出版日期: 2015-04-21
卷号: 448, 期号:4, 页码:3514-3521
关键词: accretion, accretion discs ; black hole physics ; quasars: general
DOI: 10.1093/mnras/stv269
文章类型: Article
英文摘要: There is a maximum for the gravity of a black hole in the vertical direction in the accretion disc. Outflows may probably be driven from the disc if the radiation flux of the disc is greater than a critical value corresponding to the maximal vertical gravity. We find that outflows are driven by the radiation force from the disc if the dimensionless mass accretion rate at the outer radius (m) over dot(out) greater than or similar to 1 ((m) over dot = (m) over dot/(m) over dot(Edd), (m) over dot is the mass accretion rate, (m) over dot(Edd) = L-Edd/0.1c(2), and L-Edd is the Eddington luminosity). Assuming the outflow to be strong to carry away sufficient gas from the disc surface, we find that the radiation of the disc is limited by such outflows. The disc luminosity, L-disc/L-Edd alpha ln (m) over dot(out), at large-(m) over dot(out) cases. The Eddington ratio of the disc is similar to 3 for (m) over dot(out) similar to 100, which is significantly lower than that of a conventional slim disc without outflows (but it is comparable with that given in the study by Kawaguchi). This implies that the emission from some ultraluminous X-ray sources with highly super Eddington luminosity should be Doppler beamed, or intermediate-mass black holes are in these sources instead of stellar mass black holes. The spectra of the discs surrounding massive black holes with outflows are saturated in the high-frequency end provided (m) over dot(out) greater than or similar to 2. We suggest that the saturated emission can be observed to estimate the masses of the black holes accreting at high rates, such as the narrow-line Seyfert galaxies, with the model calculations. The rate of the mass accreted by the black hole always (m) over dotin similar or equal to (m) over dot(Edd) even if the mass accretion rate at the outer radius (m) over dot(out) >> (m) over dot(Edd), because most of the gas is removed into the outflows by the radiation force. If this is the case, the luminous quasars at high redshifts z greater than or similar to 6 should have grown up through persistent accretion at a rate close to the Eddington rate.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics
研究领域[WOS]: Astronomy & Astrophysics
关键词[WOS]: ACTIVE GALACTIC NUCLEI ; SUPER-EDDINGTON ACCRETION ; BLACK-HOLE MASS ; X-RAY SOURCES ; ABSORPTION-LINE QUASARS ; ULTRA-FAST OUTFLOWS ; VERTICAL STRUCTURE ; OBSERVATIONAL APPEARANCE ; EMERGENT SPECTRA ; RADIO GALAXIES
收录类别: SCI
语种: 英语
WOS记录号: WOS:000351529500044
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/15783
Appears in Collections:毫米波和亚毫米波技术实验室_期刊论文

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作者单位: 1.Chinese Acad Sci, Shanghai Astron Observ, SHAO XMU Joint Ctr Astrophys, Shanghai 200030, Peoples R China
2.Chinese Acad Sci, Key Lab Radio Astron, Nanjing 210008, Jiangsu, Peoples R China
3.Xiamen Univ, Dept Astron, Xiamen 361005, Fujian, Peoples R China
4.Xiamen Univ, Inst Theoret Phys & Astrophys, Xiamen 361005, Fujian, Peoples R China
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