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Title:
Slim accretion disks
Authors:
Abramowicz, M. A.; Czerny, B.; Lasota, J. P.; Szuszkiewicz, E.
Affiliation:
AA(Scuola Internazionale Superiore di Studi Avanzati, Trieste, Italy; California, University, Santa Barbara), AB(Scuola Internazionale Superiore di Studi Avanzati, Trieste, Italy; Leicester, University, England), AC(Scuola Internazionale Superiore di Studi Avanzati, Trieste, Italy; Paris, Observatoire, Meudon, France), AD(Scuola Internazionale Superiore di Studi Avanzati, Trieste, Italy)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 332, Sept. 15, 1988, p. 646-658. Research supported by Observatoire de Paris and NASA. (ApJ Homepage)
Publication Date:
09/1988
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Accretion Disks, Astronomical Models, Black Holes (Astronomy), Stellar Mass Accretion, Computational Astrophysics, Eddington Approximation, Navier-Stokes Equation, Roche Limit
DOI:
10.1086/166683
Bibliographic Code:
1988ApJ...332..646A

Abstract

A new branch of equilibrium solutions for stationary accretion disks around black holes is found. These solutions correspond to moderately super-Eddington accretion rates. The existence of the new branch is a consequence of an additional cooling due to general relativistic Roche lobe overflow and horizontal advection of heat. On an accretion rate versus surface density plane the new branch forms, together with the two 'standard' branches (corresponding to the Shakura-Sunyaev accretion disk models) a characteristically S-shaped curve. This could imply a limit cycle-type behavior for black hole accretion flows with accretion rates close ot the Eddington one.

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