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Variability and Instabilities of Accretion Disks

Published online by Cambridge University Press:  19 July 2016

M.A. Abramowicz ,
J.P. Lasota  and
C. Xu
M.A. Abramowicz
Affiliation:
International School for Advanced Studies, Strada Costiera 11, 34014 Trieste, Italy
J.P. Lasota
Affiliation:
International School for Advanced Studies, Strada Costiera 11, 34014 Trieste, Italy Departement d'Astrophysique Fondamentale Observatoire de Paris Meudon, 92195 Meudon, France Institut d'Astrophysique 98 bis Bd. Arago, 75014 Paris, France
C. Xu
Affiliation:
International School for Advanced Studies, Strada Costiera 11, 34014 Trieste, Italy

Abstract

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In the Seyfert galaxy NGC 1566 and quasars 3C 345, 3C 446 long term (∼ 103 days) variations have been observed. We propose to explain them as a limit cycle behaviour, similar to that well studied in the case of dwarf novae outbursts. The key element of our analysis is the relationship between the accretion rate · and the surface density Σ.

Type
IV. Prime Movers, Models and Mechanisms
Information
Symposium - International Astronomical Union , Volume 119: Quasars , 1986 , pp. 371 - 381
Copyright
Copyright © Reidel 1986 

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