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.
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Abramowicz et al. (1998) studied this question.