The emission line spectrum of active galactic nuclei and the unifying scheme

Recent papers dealing with the most controversial aspects of AGNs are reviewed. They suggest interesting conclusions: all Seyferts can be described by a single parameter, the X-ray column density; radio loud AGNs may host a rapidly spinning black hole and radio quiet AGNs a slowly spinning black hol...

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Bibliographic Details
Published in:The Astronomy and astrophysics review 2000-06, Vol.10 (1-2), p.81-133
Main Authors: Véron-Cetty, M.P., Véron, P.
Format: Article
Language:English
Subjects:
Accretion
Emissions
Ionization
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Summary:Recent papers dealing with the most controversial aspects of AGNs are reviewed. They suggest interesting conclusions: all Seyferts can be described by a single parameter, the X-ray column density; radio loud AGNs may host a rapidly spinning black hole and radio quiet AGNs a slowly spinning black hole; high-ionization AGNs (Seyfert galaxies and QSOs) contain an optically thick, geometrically thin accretion disk, while low-ionization AGNs (Liners) contain an optically thin, geometrically thick accretion disk; a number of blazars have been classified as BLLs on the basis of insufficient data; most objects with weak broad emission lines are in fact HPQs; many objects have been called Liners although they are not AGNs but rather the result of stellar activity; type 2 QSOs exist, but are quite inconspicuous if radio quiet.[PUBLICATION ABSTRACT]
ISSN:0935-4956
1432-0754
DOI:10.1007/s001590000006