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- W3102051116 endingPage "169" @default.
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- W3102051116 abstract "We investigate the high-redshift quasar luminosity function (QLF) down to an apparent magnitude of IAB = 25 in the Cosmic Evolution Survey (COSMOS). Careful analysis of the extensive COSMOS photometry and imaging data allows us to identify and remove stellar and low-redshift contaminants, enabling a selection that is nearly complete for type-1 quasars at the redshifts of interest. We find 155 likely quasars at z > 3.1, 39 of which have prior spectroscopic confirmation. We present our sample in detail and use these confirmed and likely quasars to compute the rest-frame UV QLF in the redshift bins 3.1 < z < 3.5 and 3.5 < z < 5. The space density of faint quasars decreases by roughly a factor of four from z ∼ 3.2 to z ∼ 4, with faint-end slopes of β ∼ −1.7 at both redshifts. The decline in space density of faint optical quasars at z > 3 is similar to what has been found for more luminous optical and X-ray quasars. We compare the rest-frame UV luminosity functions found here with the X-ray luminosity function at z > 3, and find that they evolve similarly between z ∼ 3.2 and z ∼ 4; however, the different normalizations imply that roughly 75% of X-ray bright active galactic nuclei (AGNs) at z ∼ 3–4 are optically obscured. This fraction is higher than found at lower redshift and may imply that the obscured, type-2 fraction continues to increase with redshift at least to z ∼ 4. Finally, the implications of the results derived here for the contribution of quasars to cosmic reionization are discussed." @default.
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- W3102051116 date "2012-08-07" @default.
- W3102051116 modified "2023-10-01" @default.
- W3102051116 title "EVOLUTION OF THE QUASAR LUMINOSITY FUNCTION OVER 3 <<i>z</i>< 5 IN THE COSMOS SURVEY FIELD" @default.
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- W3102051116 doi "https://doi.org/10.1088/0004-637x/755/2/169" @default.
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