Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-11-30
Mon.Not.Roy.Astron.Soc. 343 (2003) 692
Astronomy and Astrophysics
Astrophysics
15 pages, 8 figures, accepted for publication in MNRAS
Scientific paper
10.1046/j.1365-8711.2003.06704.x
We construct a physically motivated analytical model for the quasar luminosity function, based on the joint star formation and feeding of massive black holes suggested by the observed correlation between the black hole mass and the stellar mass of the hosting spheroids. The parallel growth of massive black holes and host galaxies is assumed to be triggered by major mergers of haloes. The halo major merger rate is computed in the frame of the extended Press-Schechter model. The evolution of black holes on cosmological timescales is achieved by the integration of the governing set of differential equations, established from a few reasonable assumptions that account for the distinct (Eddington-limited or supply-limited) accretion regimes. Finally, the typical lightcurves of the reactivated quasars are obtained under the assumption that, in such accretion episodes, the fall of matter onto the black hole is achieved in a self-regulated stationary way. The predicted quasar luminosity function is compared to the luminosity functions of the 2dF QSO sample and other, higher redshift data. We find good agreement in all cases, except for z<1 where the basic assumption of our model is likely to break down.
Hatziminaoglou Evanthia
Manrique Alberto
Mathez Guy
Salvador-Solé Eduard
Solanes Jose Maria
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