NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-20 T14:04:51 PDT
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For refcode 2014MNRAS.438.3340E:
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NED Abstract

Copyright by Royal Astronomical Society. 2014MNRAS.438.3340E Evolution of broad-line emission from active galactic nuclei Elitzur, Moshe; Ho, Luis C.; Trump, Jonathan R. Abstract. Apart from viewing-dependent obscuration, intrinsic broad-line emission from active galactic nuclei (AGN) follows an evolutionary sequence: type 1 --> 1.2/1.5 --> 1.8/1.9 --> 2 as the accretion rate on to the central black hole is decreasing. This spectral evolution is controlled, at least in part, by the parameter L_bol_/M^2/3^, where L_bol_ is the AGN bolometric luminosity and M is the black hole mass. Both this dependence and the double-peaked profiles that emerge along the sequence arise naturally in the disc-wind scenario for the AGN broad-line region. Key words: galaxies: active, galaxies: nuclei, quasars: emission lines, quasars: general
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