Astronomy and Astrophysics – Astrophysics
Scientific paper
1995-09-17
Mon.Not.Roy.Astron.Soc. 286 (1997) 848
Astronomy and Astrophysics
Astrophysics
14 pages, uuencoded, compressed PostScript file, plus separately fig1a and fig1b: uuencoded, compressed, tar'ed PostScript fil
Scientific paper
We study an accretion disc with a hot continuous corona. We assume that the corona itself accretes and therefore it is powered directly by the release of the gravitational energy and cooled by radiative interaction with the disc. We consider the vertical structure of such a corona and show that the radial infall is accompanied by strong vertical outflow. Such a model has two important consequences: (i) at a given radius the corona forms only for accretion rate larger than a limiting value and the fraction of energy dissipated in the corona decreases with increasing accretion rate, and (ii) the disc spectra are significantly softer in the optical/UV band in comparison with the predictions of standard accretion discs due to the mass loss and the decrease of internal dissipation in the disc. Both trends correspond well to the mean spectra of radio quiet AGN and observed luminosity states in galactic black hole candidates.
Czerny Bozena
Witt Hans J.
Zycki Piotr T.
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