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

被引：0
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作者：
Meyer, F. [1 ]
Liu, B.F. [2 ]
Meyer-Hofmeister, E. [1 ]
机构：
[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, China
来源：
Astronomy and Astrophysics | 1600年 / 463卷 / 01期
关键词：
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. © ESO 2007;
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