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The 2-10 keV unabso...
The 2-10 keV unabsorbed luminosity function of AGN from the LSS, CDFS, and COSMOS surveys
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- Ranalli, P. (author)
- Lund University,Lunds universitet,Astronomi - Genomgår omorganisation,Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation,Naturvetenskapliga fakulteten,Lund Observatory - Undergoing reorganization,Department of Astronomy and Theoretical Physics - Undergoing reorganization,Faculty of Science,INAF Istituto di Astrofisica Spaziale e Fisica Cosmica, Bologna,National Observatory of Athens
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- Koulouridis, E. (author)
- National Observatory of Athens,Saclay Nuclear Research Centre (CEA Saclay)
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- Georgantopoulos, I. (author)
- National Observatory of Athens
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- Fotopoulou, S. (author)
- University of Geneva
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- Hsu, L. T. (author)
- Max Planck Institute for Extraterrestrial Physics
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- Salvato, Mara (author)
- Max Planck Institute for Extraterrestrial Physics
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- Comastri, A. (author)
- INAF Istituto di Astrofisica Spaziale e Fisica Cosmica, Bologna
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- Pierre, M. (author)
- Saclay Nuclear Research Centre (CEA Saclay)
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- Cappelluti, N. (author)
- Yale University,INAF Istituto di Astrofisica Spaziale e Fisica Cosmica, Bologna
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- Carrera, F. J. (author)
- Institute of Physics of Cantabria
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- Chiappetti, L. (author)
- INAF Institute of Space Astrophysics and Cosmic Physics of Milano
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- Lassas-Clerc, Narjisse (author)
- University of Geneva
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- Gilli, R. (author)
- INAF Istituto di Astrofisica Spaziale e Fisica Cosmica, Bologna
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- Iwasawa, K. (author)
- University of Barcelona
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- Pacaud, F. (author)
- University of Bonn
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- Paltani, S. (author)
- University of Geneva
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- Plionis, E. (author)
- Aristotle University of Thessaloniki
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- Centis Vignali, M (author)
- University of Bologna,INAF Istituto di Astrofisica Spaziale e Fisica Cosmica, Bologna
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(creator_code:org_t)
- 2016-05-16
- 2016
- English.
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In: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 590
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Abstract
Subject headings
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- The XMM-Large scale structure (XMM-LSS), XMM-Cosmological evolution survey (XMM-COSMOS), and XMM-Chandra deep field south (XMM-CDFS) surveys are complementary in terms of sky coverage and depth. Together, they form a clean sample with the least possible variance in instrument effective areas and point spread function. Therefore this is one of the best samples available to determine the 2-10 keV luminosity function of active galactic nuclei (AGN) and their evolution. The samples and the relevant corrections for incompleteness are described. A total of 2887 AGN is used to build the LF in the luminosity interval 1042-1046 erg s-1 and in the redshift interval 0.001-4. A new method to correct for absorption by considering the probability distribution for the column density conditioned on the hardness ratio is presented. The binned luminosity function and its evolution is determined with a variant of the Page-Carrera method, which is improved to include corrections for absorption and to account for the full probability distribution of photometric redshifts. Parametric models, namely a double power law with luminosity and density evolution (LADE) or luminosity-dependent density evolution (LDDE), are explored using Bayesian inference. We introduce the Watanabe-Akaike information criterion (WAIC) to compare the models and estimate their predictive power. Our data are best described by the LADE model, as hinted by the WAIC indicator. We also explore the recently proposed 15-parameter extended LDDE model and find that this extension is not supported by our data. The strength of our method is that it provides unabsorbed, non-parametric estimates, credible intervals for luminosity function parameters, and a model choice based on predictive power for future data.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- Galaxies: active
- Methods: statistical
- Surveys
- X-rays: general
Publication and Content Type
- art (subject category)
- ref (subject category)
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Ranalli, P.
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Koulouridis, E.
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Georgantopoulos, ...
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Fotopoulou, S.
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Hsu, L. T.
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Salvato, Mara
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Comastri, A.
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Pierre, M.
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Cappelluti, N.
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Carrera, F. J.
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Chiappetti, L.
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Lassas-Clerc, Na ...
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Gilli, R.
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Iwasawa, K.
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Pacaud, F.
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Paltani, S.
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Plionis, E.
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Centis Vignali, ...
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Lund University