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Boundary behaviour of accretion disks determined by gravity induced cooling near the black hole
Author(s) -
Paul H. G.
Publication year - 1986
Publication title -
astronomische nachrichten
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.394
H-Index - 63
eISSN - 1521-3994
pISSN - 0004-6337
DOI - 10.1002/asna.2113070114
Subject(s) - physics , accretion (finance) , angular momentum , accretion disc , boundary value problem , mechanics , intermediate polar , astrophysics , gravitation , classical mechanics , stars , quantum mechanics , white dwarf
In the framework of thin, rigorous relativistic accretion disks the inner boundary behaviour is studied taking into cosideration the internal energy of the disk plasma. Consuming the internal energy stored in the accretion flow the disk forms a cusplike wall in the effective gravitational potential; the disk matter is raised on higher levels of the angular momentum by cooling simultaneously. This gravity induced cooling leads to a rigorous braking of the radial accretion flow. There is a steep, inner boundary with a very small gap very close at the orbit of last bound motion of test matter. Especially natural boundary conditions can be imposed in contrast to the boundary value problem in the divergent, relativistic standard models.