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29 March 2024
 
  » arxiv » 1011.2280

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Probing the faint end of the quasar luminosity function at z ~ 4 in the COSMOS field
H. Ikeda ; T. Nagao ; K. Matsuoka ; Y. Taniguchi ; Y. Shioya ; J. R. Trump ; P. Capak ; A. Comastri ; M. Enoki ; Y. Ideue ; Y. Kakazu ; A. M. Koekemoer ; T. Morokuma ; T. Murayama ; T. Saito ; M. Salvato ; E. Schinnerer ; N. Z. Scoville ; J. D. Silverman ;
Date 10 Nov 2010
AbstractWe searched for quasars that are ~ 3 mag fainter than the SDSS quasars in the redshift range 3.7 < z < 4.7 in the COSMOS field to constrain the faint end of the quasar luminosity function. Using optical photometric data, we selected 31 quasar candidates with 22 < i’ < 24 at z ~ 4. We obtained optical spectra for most of these candidates using FOCAS on the Subaru telescope, and identified 8 low-luminosity quasars at z ~ 4. In order to derive the quasar luminosity function (QLF) based on our spectroscopic follow-up campaign, we estimated the photometric completeness of our quasar survey through detailed Monte Carlo simulations. Our QLF at z ~ 4 has a much shallower faint-end slope beta = -1.67^{+0.11}_{-0.17} than that obtained by other recent surveys in the same redshift. Our result is consistent with the scenario of downsizing evolution of active galactic nuclei inferred by recent optical and X-ray quasar surveys at lower redshifts.
Source arXiv, 1011.2280
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