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Astron. Astrophys. 348, 71-76 (1999)

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Emission lines from illuminated warped accretion disks in AGN

Rumen Bachev

Institute of Astronomy, Bulgarian Academy of Sciences, 72 Tsarigradsko Chausse Blvd., 1784 Sofia, Bulgaria (bachevr@astro.bas.bg)

Received 18 August 1998 / Accepted 8 March 1999

Abstract

The broad line profiles (HFI ) from a nonplanar accretion disk resulting from reprocessing of hard X-ray radiation are studied in this paper. The simplest model of a disk with small inclination and a central point-like source of ionizing radiation is adopted. The profiles obtained depend significantly on the line of sight - they are asymmetric as well as frequency-shifted in most cases. Since such frequency shifted asymmetric profiles are generally not observed in AGN, the most plausible interpretation may be that either the major part of the broad emission does not originate from the disk, but from different matter near the hole, or the disk is in general planar. The latter situation might apply to non-rotating black holes, for which the accretion disk is not warped. The emission lines are then similar to those from planar disks, i. e. almost symmetric, double-peaked and non frequency-shifted. Symmetric and double-peaked profiles might also be observed in case of an accretion disk transparent to visual light and/or X-rays.

Key words: accretion, accretion disks – line: profiles – galaxies: active – galaxies: quasars: emission lines

This article contains no SIMBAD objects.

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© European Southern Observatory (ESO) 1999

Online publication: July 16, 1999
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