THE POPULATION OF HIGH-REDSHIFT ACTIVE GALACTIC NUCLEI IN THE CHANDRA-COSMOS SURVEY

被引：73

作者：

Civano, F. ^{[1
]}

Brusa, M. ^{[2
]}

Comastri, A. ^{[3
]}

Elvis, M. ^{[1
]}

Salvato, M. ^{[4
]}

Zamorani, G. ^{[3
]}

Capak, P. ^{[5
]}

Fiore, F. ^{[6
]}

Gilli, R. ^{[3
]}

Hao, H. ^{[1
]}

Ikeda, H. ^{[7
]}

Kakazu, Y. ^{[5
]}

Kartaltepe, J. S. ^{[8
]}

Masters, D. ^{[5
,9
]}

Miyaji, T. ^{[10
]}

Mignoli, M. ^{[3
]}

Puccetti, S. ^{[11
]}

Shankar, F. ^{[12
]}

Silverman, J. ^{[13
]}

Vignali, C. ^{[14
]}

Zezas, A. ^{[1
,15
]}

Koekemoer, A. M. ^{[16
]}

机构：

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

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

[3] INAF Osservatorio Astron Bologna, I-40127 Bologna, Italy

[4] Max Planck Inst Plasma Phys, D-85748 Garching, Germany

[5] CALTECH, Pasadena, CA 91125 USA

[6] INAF Osservatorio Astron Roma, Rome, Italy

[7] Ehime Univ, Grad Sch Sci & Engn, Matsuyama, Ehime 7908577, Japan

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

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

[10] Univ Nacl Autonoma Mexico Ensenada, Inst Astron, Ensenada 22860, Baja California, Mexico

[11] ASI Sci Data Ctr, I-00044 Frascati, Italy

[12] Max Planck Inst Astrophys, D-85748 Garching, Germany

[13] Univ Tokyo, IPMU, Chiba 2778568, Japan

[14] Univ Bologna, Dipartimento Astron, I-40127 Bologna, Italy

[15] Univ Crete, Dept Phys, GR-71003 Iraklion, Crete, Greece

[16] Space Telescope Sci Inst, Baltimore, MD 21218 USA

来源：

ASTROPHYSICAL JOURNAL | 2011年 / 741卷 / 02期

关键词：

evolution; galaxies: active; surveys; X-rays: galaxies; QUASAR LUMINOSITY FUNCTION; SUPERMASSIVE BLACK-HOLES; DEEP FIELD-SOUTH; SIMILAR-TO; 4; DIGITAL-SKY-SURVEY; LY-ALPHA EMITTERS; FAINT END; STAR-FORMATION; SPACE DENSITY; EVOLUTION;

D O I：

10.1088/0004-637X/741/2/91

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present the high-redshift (3 < z < 5.3) 0.5-2 keV number counts and the 2-10 keV (rest-frame) space density of X-ray-selected active galactic nuclei (AGNs) detected in the Chandra Cosmic Evolution Survey. The sample comprises 81 X-ray-detected sources with available spectroscopic (31) and photometric (50) redshifts plus 20 sources with a formal z(phot) < 3 but with a broad photometric redshift probability distribution, such that z(phot) + 1 sigma > 3. Eighty-one sources are selected in the 0.5-2 keV band, fourteen are selected in the 2-10 keV and six in the 0.5-10 keV bands. We sample the high-luminosity (log L((2-10 keV)) > 44.15 erg s(-1)) space density up to z similar to 5 and a fainter luminosity range (43.5 erg s(-1) < log L((2-10 keV)) < 44.15 erg s(-1)) than previous studies, up to z = 3.5. We weighted the contribution to the number counts and the space density of the sources with photometric redshift by using their probability of being at z > 3. We find that the space density of high-luminosity AGNs declines exponentially at all the redshifts, confirming the trend observed for optically selected quasars. At lower luminosity, the measured space density is not conclusive, and a larger sample of faint sources is needed. Comparisons with optical luminosity functions and black hole formation models are presented together with prospects for future surveys.

引用

页数：11

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