Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-12-18
Astronomy and Astrophysics
Astrophysics
6 pages, 1 figure, accepted for publication in A&A
Scientific paper
10.1051/0004-6361:20011449
We study the transition from the geometrically thin disk to the hot coronal flow for accretion onto black holes. The efficiency of evaporation determines the truncation of the geometrically thin disk as a function of the black hole mass and the mass flow rate in the outer disk. The physics of the evaporation was already described in detail in earlier work (Meyer et al. 2000b). We show now that the value of the viscosity parameter for the coronal gas has a strong influence on the evaporation efficiency. For smaller values of the viscosity evaporation is less efficient. For a given mass flow rate from outside the geometrically thin disk then extends farther inward. Spectral transitions between soft and hard states are then expected for different mass flow rates in the outer disk. The physics is the same for the cases of stellar and supermassive black holes systems.
Meyer Fernand
Meyer-Hofmeister Emmi
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