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A note on the conditions for SSD–ADAF transitions |
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| Authors: | Marek A Abramowicz Igor V Igumenshchev & Jean-Pierre Lasota |
| Institution: | Department of Astronomy &Astrophysics, Göteborg University and Chalmers University of Technology, 412 96 Göteborg, Sweden,;NORDITA, Blegdamsvej 17, DK-2100 Copenhagen Ø, Denmark,;Institute of Astronomy, 48 Pyatnitskaya Street, Moscow 109017, Russia,;UPR 176 du CNRS, DARC, Observatoire de Paris, Section de Meudon, 92195 Meudon Cedex, France |
| Abstract: | One of the necessary matching conditions between an optically thin, hot, advectively dominated part of an accretion disc (ADAF) and the standard Shakura–Sunyaev disc (SSD) part is that the matching transition region must rotate with an orbital speed that is faster than the Keplerian one. We discuss properties of the SSD–ADAF transition in terms of a simple two-dimensional hydrodynamical model. |
| Keywords: | accretion accretion discs convection hydrodynamics |