EVOLUTION OF THE QUASAR LUMINOSITY FUNCTION OVER 3 < z < 5 IN THE COSMOS SURVEY FIELD

被引：110

作者：

Masters, D. ^{[1
,2
]}

Capak, P. ^{[3
,4
]}

Salvato, M. ^{[5
]}

Civano, F. ^{[6
]}

Mobasher, B. ^{[1
]}

Siana, B. ^{[1
]}

Hasinger, G. ^{[7
]}

Impey, C. D. ^{[8
,9
]}

Nagao, T. ^{[10
]}

Trump, J. R. ^{[11
,12
]}

Ikeda, H. ^{[10
]}

Elvis, M. ^{[11
,12
]}

Scoville, N. ^{[3
]}

机构：

[1] Univ Calif Riverside, Dept Phys & Astron, Riverside, CA 92521 USA

[2] Observ Carnegie Inst Washington, Pasadena, CA 91101 USA

[3] CALTECH, Dept Astron, Pasadena, CA 91125 USA

[4] Spitzer Sci Ctr, Pasadena, CA 91125 USA

[5] Max Planck Inst Extraterr Phys, D-85748 Garching, Germany

[6] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA

[7] Univ Hawaii, Inst Astron, Honolulu, HI 96822 USA

[8] Princeton Univ, Dept Astrophys Sci, Princeton, NJ 08544 USA

[9] Univ Arizona, Steward Observ, Tucson, AZ 85721 USA

[10] Ehime Univ, Res Ctr Space & Cosm Evolut, Matsuyama, Ehime 7908577, Japan

[11] Univ Calif Santa Cruz, Lick Observ, Univ Calif Observ, Santa Cruz, CA 95064 USA

[12] Univ Calif Santa Cruz, Dept Astron & Astrophys, Santa Cruz, CA 95064 USA

来源：

ASTROPHYSICAL JOURNAL | 2012年 / 755卷 / 02期

基金：

美国国家科学基金会;

关键词：

cosmology: observations; galaxies: luminosity function; mass function; Galaxy: evolution; quasars: general; ACTIVE GALACTIC NUCLEI; SUPERMASSIVE BLACK-HOLES; DIGITAL-SKY-SURVEY; SPECTRAL ENERGY-DISTRIBUTIONS; STAR-FORMATION HISTORY; SIMILAR-TO; HIGH-REDSHIFT; RADIATIVE-TRANSFER; FAINT END; PHOTOMETRIC REDSHIFT;

D O I：

10.1088/0004-637X/755/2/169

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We investigate the high-redshift quasar luminosity function (QLF) down to an apparent magnitude of I-AB = 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 similar to 3.2 to z similar to 4, with faint-end slopes of beta similar to -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 similar to 3.2 and z similar to 4; however, the different normalizations imply that roughly 75% of X-ray bright active galactic nuclei (AGNs) at z similar to 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 similar to 4. Finally, the implications of the results derived here for the contribution of quasars to cosmic reionization are discussed.

引用

页数：16

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EVOLUTION OF THE QUASAR LUMINOSITY FUNCTION OVER 3 &lt; z &lt; 5 IN THE COSMOS SURVEY FIELD

EVOLUTION OF THE QUASAR LUMINOSITY FUNCTION OVER 3 < z < 5 IN THE COSMOS SURVEY FIELD