Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...290...19h&link_type=abstract
Astronomy and Astrophysics 290, 19-33 (1994)
Astronomy and Astrophysics
Astrophysics
34
Accretion Disks, Galaxies: Active, Nuclei
Scientific paper
A study of the outer regions of geometrically thin stationary accretion discs in Active Galactic Nuclei (AGN) is performed in the framework of the α prescription for the turbulent viscosity, with the simplifying assumption of a vertically homogeneous medium. We show that in low luminosity objects a large part of the disc is in a molecular form. We stress the importance of computing correctly the opacity. We concentrate on the problem of self-gravity, which should not be handled with the "stress tensor prescription", and which leads to a squeezing of the disc at relatively small radii. We discuss the influence of an external irradiation, and show that it has a negligible effect on the radial structure. We discuss the thermal and viscous stability of our solutions. Finally we give the radial disc structure for different central masses and accretion rates. We show that the inner region is thermally and/or viscously unstable and the outer (molecular) one is stable. However in high luminosity objects this molecular region is entirely suppressed by self-gravity.
Collin-Souffrin Suzy
Hure Jean-Marc
Le Bourlot Jacques
Pineau des Forêts Guillaume
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