Modeling the QSO luminosity and spatial clustering at low redshifts

Details Modeling the QSO luminosity and spatial clustering at low redshifts Modeling the QSO luminosity and spatial clustering at low redshifts

2006-02-16

arxiv.org/abs/astro-ph/0602361v1

Mon.Not.Roy.Astron.Soc.368:1269-1280,2006

Astronomy and Astrophysics

Astrophysics

13 pages, 9 figures. Accepted by MNRAS

Scientific paper

10.1111/j.1365-2966.2006.10195.x

We investigate the ability of hierarchical models of QSO formation and evolution to match the observed luminosity, number counts and spatial clustering of quasars at redshift z<2. These models assume that the QSO emission is triggered by galaxy mergers, that the mass of the central black hole correlates with halo properties and that quasars shine at their Eddington luminosity except, perhaps, during the very early stages of evolution. We find that models based on simple analytic approximations successfully reproduce the observed B-band QSO luminosity function at all redshifts, provided that some mechanisms is advocated to quench mass accretion within haloes larger than about 1e13 Msun that host bright quasars. These models also match the observed strength of QSO clustering at z~0.8. At larger redshifts, however, they underpredict the QSO biasing which, instead, is correctly reproduced by semi-analytic models in which the halo merger history and associated BHs are followed by Monte Carlo realizations of the merger hierarchy. We show that the disagreement between the luminosity function predicted by semi-analytic models and observations can be ascribed to the use of B-band data, which are a biased tracer of the quasar population, due to obscuration.

Affiliated with

Also associated with

No associations

Rating

Modeling the QSO luminosity and spatial clustering at low redshifts does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Modeling the QSO luminosity and spatial clustering at low redshifts, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Modeling the QSO luminosity and spatial clustering at low redshifts will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-102700