Re-condensation from an ADAF into an inner disk: the intermediate state of black hole accretion?

	Re-condensation from an ADAF into an inner disk: the intermediate state of black hole accretion?
	Meyer, F 1; Liu BF(刘碧芳)2 ; Meyer-Hofmeister, E 1
刊名	ASTRONOMY & ASTROPHYSICS
	2007-02
卷号	463 期号:1 页码:1-9
关键词	accretion, accretion disks black hole physics X-rays : binaries stars : individual : Cyg X-1
ISSN号	0004-6361
通讯作者	Meyer, F (reprint author), Max Planck Inst Astrophys, Karl Schwarzschild Str 1, D-85740 Garching, Germany.
产权排序	第二完成单位
英文摘要	Context. Accretion onto galactic and supermassive black holes occurs in different modes, which are documented in hard and soft spectral states, commonly attributed to an advection-dominated flow (ADAF) inside a truncated disk and standard disk accretion, respectively. At the times of spectral transition an intermediate state is observed, for which the accretion flow pattern is still unclear. Aims. We analyze the geometry of the accretion flow when the mass flow rate in the disk decreases (soft/hard transition) and evaporation of gas into the coronal flow leads to disk truncation. Methods. We evaluate the physics of an advection-dominated flow affected by thermal conduction to a cool accretion disk underneath. Results. We find re-condensation of gas from the ADAF into the underlying inner disk at distances from the black hole and at rates, that depend on the properties of the hot ADAF and vary with the mass accretion rate. This sustains an inner disk for longer than a viscous decay time after the spectral transition occurred, in accordance with the spectra that indicate cool gas in the neighborhood of the accreting black hole. The model allows us to understand why Cyg X-1 does not show hysteresis in the spectral state transition luminosity that is commonly observed for X-ray transient sources. Conclusions. Our results shed new light on the complex mass flow pattern during spectral state transition.
学科主题	Astronomy & Astrophysics
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	X-RAY BINARIES ; ADVECTION-DOMINATED ACCRETION ; ACTIVE GALACTIC NUCLEI ; ALL-SKY MONITOR ; SPECTRAL STATE ; TEMPORAL PROPERTIES ; XTE J1650-500 ; CORONAL FLOW ; LIGHT CURVES ; DWARF NOVAE
收录类别	SCI ; EI
原文出处	http://www.aanda.org/articles/aa/abs/2007/07/aa6203-06/aa6203-06.html
语种	英语
WOS记录号	WOS:000243941900001
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/4956]
专题	云南天文台_高能天体物理研究组
作者单位	1.Max-Planck-Institut für Astrophysik, Karl- Schwarzschildstr. 1, 85740 Garching, Germany 2.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, PO Box 110, Kunming 650011, PR China
推荐引用方式 GB/T 7714	Meyer, F,Liu BF,Meyer-Hofmeister, E. Re-condensation from an ADAF into an inner disk: the intermediate state of black hole accretion?[J]. ASTRONOMY & ASTROPHYSICS,2007,463(1):1-9.
APA	Meyer, F,Liu BF,&Meyer-Hofmeister, E.(2007).Re-condensation from an ADAF into an inner disk: the intermediate state of black hole accretion?.ASTRONOMY & ASTROPHYSICS,463(1),1-9.
MLA	Meyer, F,et al."Re-condensation from an ADAF into an inner disk: the intermediate state of black hole accretion?".ASTRONOMY & ASTROPHYSICS 463.1(2007):1-9.