Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-01-07
Mon.Not.Roy.Astron.Soc. 344 (2003) 468
Astronomy and Astrophysics
Astrophysics
6 pages, 3 figures. Revised version, added system of equations. Accepted for publication in MNRAS
Scientific paper
10.1046/j.1365-8711.2003.06832.x
We consider time-dependent models for rotating accretion flows onto black holes, where a transition takes place from an outer cooling-dominated disc to a radiatively inefficient flow in the inner region. In order to allow for a transition of this type we solve the energy equation, both, for the gas and for the radiation field, including a radiative cooling flux and a turbulent convective heat flux directed along the negative entropy gradient. The transition region is found to be highly variable, and a corresponding variation expected for the associated total luminosity. In particular, rapid oscillations of the transition radius are present on a timescale comparable with the local Keplerian rotation time. These oscillations are accompanied by a quasi-periodic modulation of the mass flux at the outer edge of the advection-dominated accretion flow (ADAF). We speculate about the relevance for the high-frequency QPO phenomenon.
Camenzind Max
Gracia José
Keller Ch.
Peitz Jochen
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