NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-25 T19:44:49 PDT
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For refcode 2000A&ARv..10...81V:
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NED Abstract

Copyright by European Southern Observatory (ESO). Reproduced by permission
2000A&ARv..10...81V The emission line spectrum of active galactic nuclei and the unifying scheme Veron-Cetty, M. P.; Veron, P. Received 16 November 1999 Abstract: 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. Key words: Galaxies: active - BL Lacertae objects - Quasars - Seyfert
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