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

Bongiorno, A. and Mignoli, M. and Zamorani, G. and Lamareille, F. and Lanzuisi, G. and Miyaji, T. and Bolzonella, M. and Carollo, C. M. and Contini, T. and Kneib, J. P. and Le Fèvre, O. and Lilly, S. J. and Mainieri, V. and Renzini, A. and Scodeggio, M. and Bardelli, S. and Brusa, M. and Caputi, K. and Civano, F. and Coppa, G. and Cucciati, O. and de la Torre, S. and de-Ravel, L. and Franzetti, P. and Garilli, B. and Halliday, C. and Hasinger, G. and Koekemoer, A. M. and Iovino, A. and Kampczyk, P. and Knobel, C. and Kovač, K. and Le Borgne, J.-F. and Le-Brun, V. and Maier, C. and Merloni, A. and Nair, P. and Pellò, R. and Peng, Y. and Pérez-Montero, E. and Ricciardelli, E. and Salvato, M. and Silverman, J. and Tanaka, M. and Tasca, L. and Tresse, L. and Vergani, D. and Zucca, E. and Abbas, U. and Bottini, D. and Cappi, A. and Cassata, P. and Cimatti, A. and Guzzo, L. and Leauthaud, A. and Maccagni, D. and Marinoni, C. and McCracken, H. J. and Memeo, P. and Meneux, B. and Oesch, P. and Porciani, C. and Pozzetti, L. and Scaramella, R. (2010) The [O III] emission line luminosity function of optically selected type-2 AGN from zCOSMOS. Astronomy and Astrophysics, 510 . Art. No. A56. ISSN 0004-6361. doi:10.1051/0004-6361/200913229.

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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_☉ < L_([O III]) < 10^(9.1) L_☉. 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 [O III]λ5007 Å 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]/Hβ versus [N II]/Hα and [O III]/Hβ versus [S II]/Hα) to isolate AGN in the redshift range 0.15 < z < 0.45 and the diagnostic diagram [O III]/Hβ versus [O II]/Hβ 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.

Item Type:Article
Related URLs:
URLURL TypeDescription
Lanzuisi, G.0000-0001-9094-0984
Carollo, C. M.0000-0003-1624-7609
Kneib, J. P.0000-0002-4616-4989
Le Fèvre, O.0000-0001-5891-2596
Lilly, S. J.0000-0002-6423-3597
Renzini, A.0000-0002-7093-7355
Brusa, M.0000-0002-5059-6848
Caputi, K.0000-0001-8183-1460
Civano, F.0000-0002-2115-1137
Cucciati, O.0000-0002-9336-7551
de la Torre, S.0000-0002-0839-2884
Hasinger, G.0000-0002-0797-0646
Koekemoer, A. M.0000-0002-6610-2048
Salvato, M.0000-0001-7116-9303
Silverman, J.0000-0002-0000-6977
Tanaka, M.0000-0002-5011-5178
Leauthaud, A.0000-0002-3677-3617
McCracken, H. J.0000-0002-9489-7765
Oesch, P.0000-0001-5851-6649
Additional Information:© ESO 2010. Received 2 September 2009. Accepted 17 November 2009. A.B. wishes to thank the referee for the useful suggestions that significantly improved the manuscript. A.B. also thank H. Netzer for the the stimulating discussion, R. Fassbender for helping to improve the manuscript and S. Savaglio for sharing the expertise. This work is based on the zCOSMOS ESO Large Program Number 175.A-0839 and was supported by an INAF contract PRIN/2007/, and an ASI grant ASI/COFIS/WP3110 I/026/07/0, Partial support of this work is provided by NASA ADP NNX07AT02G, CONACyT 83564, and PAPIITIN110209. These results are also based in part on observations obtained with XMM-Newton, an ESA Science Mission with instruments and contributions directly funded by ESA Member States and the USA (NASA).
Group:COSMOS, Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Istituto Nazionale di Astrofisica (INAF)PRIN/2007/
Agenzia Spaziale Italiana (ASI)ASI/COFIS/WP3110 I/026/07/0
Consejo Nacional de Ciencia y Tecnología (CONACyT)83564
Dirección General Asuntos del Personal (DGAPA)PAPIIT IN 110209
Subject Keywords:surveys galaxies: active
Record Number:CaltechAUTHORS:20100416-154341585
Persistent URL:
Official Citation:The [O iii] emission line luminosity function of optically selected type-2 AGN from zCOSMOSFormula A. Bongiorno, M. Mignoli, G. Zamorani, F. Lamareille, G. Lanzuisi, T. Miyaji, M. Bolzonella, C. M. Carollo, T. Contini, J. P. Kneib, O. Le Fèvre, S. J. Lilly, V. Mainieri, A. Renzini, M. Scodeggio, S. Bardelli, M. Brusa, K. Caputi, F. Civano, G. Coppa, O. Cucciati, S. de la Torre, L. de Ravel, P. Franzetti, B. Garilli, C. Halliday, G. Hasinger, A. M. Koekemoer, A. Iovino, P. Kampczyk, C. Knobel, K. Kova, J. -F. Le Borgne, V. Le Brun, C. Maier, A. Merloni, P. Nair, R. Pello, Y. Peng, E. Perez Montero, E. Ricciardelli, M. Salvato, J. Silverman, M. Tanaka, L. Tasca, L. Tresse, D. Vergani, E. Zucca, U. Abbas, D. Bottini, A. Cappi, P. Cassata, A. Cimatti, L. Guzzo, A. Leauthaud, D. Maccagni, C. Marinoni, H. J. McCracken, P. Memeo, B. Meneux, P. Oesch, C. Porciani, L. Pozzetti and R. Scaramella A&A 510 A56 (2010) DOI: 10.1051/0004-6361/200913229
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:18009
Deposited On:19 Apr 2010 16:48
Last Modified:08 Nov 2021 23:40

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