The [O III] emission line luminosity function of optically selected type-2 AGN from zCOSMOS

被引：55

作者：

Bongiorno, A. ^{[1
,2
]}

Mignoli, M. ^{[3
]}

Zamorani, G. ^{[3
]}

Lamareille, F. ^{[4
]}

Lanzuisi, G. ^{[5
,6
]}

Miyaji, T. ^{[7
,8
]}

Bolzonella, M. ^{[3
]}

Carollo, C. M. ^{[9
]}

Contini, T. ^{[4
]}

Kneib, J. P. ^{[10
]}

Le Fevre, O. ^{[10
]}

Lilly, S. J. ^{[9
]}

Mainieri, V. ^{[11
]}

Renzini, A. ^{[12
]}

Scodeggio, M. ^{[13
]}

Bardelli, S. ^{[3
]}

Brusa, M. ^{[1
]}

Caputi, K. ^{[9
]}

Civano, F. ^{[5
]}

Coppa, G. ^{[3
,14
]}

Cucciati, O. ^{[10
]}

de la Torre, S. ^{[10
,13
,15
]}

de Ravel, L. ^{[10
]}

Franzetti, P. ^{[13
]}

Garilli, B. ^{[13
]}

Halliday, C. ^{[16
]}

Hasinger, G. ^{[1
,17
]}

Koekemoer, A. M. ^{[18
]}

Iovino, A. ^{[13
]}

Kampczyk, P. ^{[9
]}

Knobel, C. ^{[9
]}

Kovac, K. ^{[9
]}

Le Borgne, J. -F. ^{[4
]}

Le Brun, V. ^{[10
]}

Maier, C. ^{[9
]}

Merloni, A. ^{[1
,19
]}

Nair, P. ^{[3
]}

Pello, R. ^{[4
]}

Peng, Y. ^{[9
]}

Perez Montero, E. ^{[4
,20
]}

Ricciardelli, E. ^{[21
]}

Salvato, M. ^{[17
,19
,22
]}

Silverman, J. ^{[9
]}

Tanaka, M. ^{[11
]}

Tasca, L. ^{[10
,13
]}

Tresse, L. ^{[10
]}

Vergani, D. ^{[3
]}

Zucca, E. ^{[3
]}

Abbas, U. ^{[10
]}

Bottini, D. ^{[13
]}

机构：

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

[2] Univ Maryland, Baltimore, MD 21250 USA

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

[4] Univ Toulouse, CNRS, Lab Astrophys Toulouse Tarbes, F-31400 Toulouse, France

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

[6] Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy

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

[8] Univ Calif San Diego, Ctr Astrophys & Space Sci, La Jolla, CA 92093 USA

[9] ETH, Dept Phys, CH-8093 Zurich, Switzerland

[10] Univ Aix Marseille, Lab Astrophys Marseille, CNRS, F-13388 Marseille 13, France

[11] ESO, D-85748 Garching, Germany

[12] Osserv Astron Padova, INAF, Padua, Italy

[13] Ist Astrofis Spaziale & Fis Cosm Milano, INAF, I-20133 Milan, Italy

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

[15] Osserv Astron Brera, INAF, I-20121 Milan, Italy

[16] Osserv Astrofis Arcetri, I-50125 Florence, Italy

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

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

[19] TUM, Excellence Cluster Universe, D-85748 Garching, Germany

[20] CSIC, Inst Astrofis Andalucia, E-18080 Granada, Spain

[21] Univ Padua, Dipartimento Astron, I-35122 Padua, Italy

[22] CALTECH, Pasadena, CA 91125 USA

[23] Univ Massachusetts, Dept Astron, Amherst, MA 01003 USA

[24] Ctr Phys Theor, Marseille, France

[25] Univ Paris 06, Inst Astrophys Paris, Paris, France

[26] Osserv Astron Roma, INAF, I-00040 Monte Porzio Catone, Italy

来源：

ASTRONOMY & ASTROPHYSICS | 2010年 / 510卷

关键词：

surveys; galaxies: active; ACTIVE GALACTIC NUCLEI; DIGITAL SKY SURVEY; HARD X-RAY; WIDE-FIELD SURVEY; XMM-NEWTON OBSERVATIONS; HIGH-REDSHIFT QUASARS; COSMOS FIELD; SPECTRAL CLASSIFICATION; STARBURST GALAXIES; HOST GALAXIES;

D O I：

10.1051/0004-6361/200913229

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Aims. We present a catalog of 213 type-2 AGN selected from the zCOSMOS survey. The selected sample covers a wide redshift range (0.15 < z < 0.92) and is deeper than any other previous study, encompassing the luminosity range 10(5.5) L-circle dot < L-[OIII] < 10(9.1) L-circle dot. We explore the intrinsic properties of these AGN and the relation to their X-ray emission (derived from the XMM-COSMOS observations). We study their evolution by computing the [OIII]lambda 5007 angstrom line luminosity function (LF) and we constrain the fraction of obscured AGN as a function of luminosity and redshift. Methods. The sample was selected on the basis of the optical emission line ratios, after applying a cut to the signal-to-noise ratio (S/N) of the relevant lines. We used the standard diagnostic diagrams ([O III]/H beta versus [N II]/H alpha and [OIII]/H beta versus [S II]/H alpha) to isolate AGN in the redshift range 0.15 < z < 0.45 and the diagnostic diagram [O III]/H beta versus [O II]/H beta to extend the selection to higher redshift (0.5 < z < 0.92). Results. Combining our sample with one drawn from SDSS, we found that the best description of the evolution of type-2 AGN is a luminosity-dependent density evolution model. Moreover, using the type-1 AGN LF we were able to constrain the fraction of type-2 AGN to the total (type-1 + type-2) AGN population. We found that the type-2 fraction decreases with luminosity, in agreement with the most recent results, and shows signs of a slight increase with redshift. However, the trend with luminosity is visible only after combining the SDSS+zCOSMOS samples. From the COSMOS data points alone, the type-2 fraction seems to be quite constant with luminosity.

引用

页数：15

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