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2011MNRAS.413.1495D - Mon. Not. R. Astron. Soc., 413, 1495-1504 (2011/May-2)
The cosmogony of supermassive black holes.
DUSCHL W.J. and STRITTMATTER P.A.
Abstract (from CDS):
{\listitem {\label (i)} {\par}the initial mass supply rate {img} from the disc increases with {\em M}_d, 0_ and compactness, adjusts rapidly (on a viscous time-scale) to its peak value and decreases steadily thereafter;} {\listitem {\label (ii)} {\par}peak SMBH mass accretion rate and hence luminosity occurs when the (decreasing) disc flow rate equals the (increasing) black hole (BH) Eddington rate and is proportional to the BH mass, {\em M}^Edd^_BH_, at that juncture;} {\listitem {\label (iii)} {\par}the fractional disc mass lost during the Eddington-limited phase increases with {\em M}_d, 0_ and compactness so strongly that, for given (large) {\em M}_d, 0_, the peak BH luminosity and corresponding mass occurs for some intermediate value of {\em s}_max, 0_ so that {\em M}^Edd^_BH_ declines for more compact initial discs;} {\listitem {\label (iv)} {\par}SMBHs with mass {\em M}_BH_ >= 10^9^ M_{sun}_ and luminosity {\em L}_GC_ >= 3 {x} 10^13^ L_{sun}_ can form in a time {\em t} < 10^9^ yr as required by the most luminous high-redshift quasi-stellar objects but the Eddington-induced mass-loss renders unlikely the creation of BHs of comparable or greater mass or luminosity in significantly shorter times;} {\listitem {\label (v)} {\par}the most luminous quasars form and die at the earliest epochs while those of lower luminosity occur over successively longer periods ranging up to the present time;} {\listitem {\label (vi)} {\par}in general, AGNs that are at an early evolutionary phase accrete at or close to their Eddington rate but evolve into the sub-Eddington regime later on.} {\par}The proposed scenario appears capable of accounting for many of the features of the observed quasar and AGN luminosity distribution with redshift and seems to be a natural consequence of the formation of massive central discs following major galaxy mergers.
Abstract Copyright: 2011 The Authors Monthly Notices of the Royal Astronomical Society2011 RAS
Journal keyword(s): accretion, accretion discs - galaxies: active - galaxies: high-redshift - galaxies: nuclei - quasars: general - galaxies: Seyfert
Simbad objects: 2
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