Accretion disk modeling of AGN continuum using non-LTE stellar atmospheres

Details Accretion disk modeling of AGN continuum using non-LTE stellar atmospheres Accretion disk modeling of AGN continuum using non-LTE stellar atmospheres

Jun 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988esasp.281b.283s&link_type=abstract

In ESA, Proceedings of the Celebratory Symposium on a Decade of UV Astronomy with the IUE Satellite, Volume 2 p 283-286 (SEE N89

Astronomy and Astrophysics

Astronomy

2

Accretion Disks, Active Galactic Nuclei, Lyman Spectra, Stellar Atmospheres, Stellar Gravitation, Stellar Models, Doppler Effect, Interstellar Magnetic Fields, Iue, Relativistic Effects, Schwarzschild Metric, Spaceborne Astronomy, Ultraviolet Astronomy, Ultraviolet Spectra

Scientific paper

Active galactic nuclei (AGN) accretion disk spectra were calculated using non-LTE stellar atmosphere models for Kerr and Schwarzschild geometries. It is found that the Lyman limit absorption edge, probably the most conclusive observational evidence for the accretion disk, would be drastically distorted and displaced by the relativistic effects from the large gravitational field of the central black hole and strong Doppler motion of emitting material on the disk surface. These effects are especially pronounced in the Kerr geometry. The strength of the Lyman limit absorption is very sensitive to the surface gravity in the stellar atmosphere models used. For models at the same temperature but different surface gravities, the strength of the Lyman edge exhibits an almost exponential decrease as the surface gravity approach the Eddington limit, which should approximate the thin disk atmosphere. The relativistic effects as well as the vanishing of the Lyman edge at the Eddington gravity may be the reasons that not many Lyman edges in the rest frames of AGNs and quasars are found.

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