Vertical structure of accretion discs with hot coronae in active galactic nuclei

Details Vertical structure of accretion discs with hot coronae in active galactic nuclei Vertical structure of accretion discs with hot coronae in active galactic nuclei

May 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999mnras.305..481r&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 305, Issue 3, pp. 481-491.

Astronomy and Astrophysics

Astronomy

48

Accretion, Accretion Discs, Line: Formation, Line: Profiles, Galaxies: Active, Galaxies: Nuclei, Quasars: Emission Lines

Scientific paper

We study the vertical structure of a radiation-pressure-dominated disc with a hot corona. We include all the relevant processes like bound-free opacity and convection. We show that the presence of the corona modifies considerably the density and the opacity of the disc surface layers, which are important from the point of view of spectrum formation. The surface of the disc with a corona is much denser and less ionized than the surface of a bare disc. Such a disc is likely to produce a neutral reflection and a local spectrum close to a blackbody. This effect will help to reconcile the predictions of accretion disc models with the observational data since a neutral reflection and a lack of Lyman edge are generally seen in active galactic nuclei.

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