The 2-10 keV unabsorbed luminosity function of AGN from the LSS, CDFS, and COSMOS surveys

P. Ranalli, E. Koulouridis, I. Georgantopoulos, S. Fotopoulou, L. T. Hsu, M. Salvato, A. Comastri, M. Pierre, Nico Cappelluti, F. J. Carrera, L. Chiappetti, N. Clerc, R. Gilli, K. Iwasawa, F. Pacaud, S. Paltani, E. Plionis, C. Vignali

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

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.

Original languageEnglish (US)
Article numberA80
JournalAstronomy and Astrophysics
Volume590
DOIs
StatePublished - Jan 1 2016
Externally publishedYes

Fingerprint

large-scale structure of the universe
active galactic nuclei
luminosity
XMM-Newton telescope
Akaike information criterion
intervals
COSMOS
estimates
point spread functions
inference
erg
hardness
sky
power law

Keywords

  • Galaxies: active
  • Methods: statistical
  • Surveys
  • X-rays: general

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Ranalli, P., Koulouridis, E., Georgantopoulos, I., Fotopoulou, S., Hsu, L. T., Salvato, M., ... Vignali, C. (2016). The 2-10 keV unabsorbed luminosity function of AGN from the LSS, CDFS, and COSMOS surveys. Astronomy and Astrophysics, 590, [A80]. https://doi.org/10.1051/0004-6361/201527013

The 2-10 keV unabsorbed luminosity function of AGN from the LSS, CDFS, and COSMOS surveys. / Ranalli, P.; Koulouridis, E.; Georgantopoulos, I.; Fotopoulou, S.; Hsu, L. T.; Salvato, M.; Comastri, A.; Pierre, M.; Cappelluti, Nico; Carrera, F. J.; Chiappetti, L.; Clerc, N.; Gilli, R.; Iwasawa, K.; Pacaud, F.; Paltani, S.; Plionis, E.; Vignali, C.

In: Astronomy and Astrophysics, Vol. 590, A80, 01.01.2016.

Research output: Contribution to journalArticle

Ranalli, P, Koulouridis, E, Georgantopoulos, I, Fotopoulou, S, Hsu, LT, Salvato, M, Comastri, A, Pierre, M, Cappelluti, N, Carrera, FJ, Chiappetti, L, Clerc, N, Gilli, R, Iwasawa, K, Pacaud, F, Paltani, S, Plionis, E & Vignali, C 2016, 'The 2-10 keV unabsorbed luminosity function of AGN from the LSS, CDFS, and COSMOS surveys', Astronomy and Astrophysics, vol. 590, A80. https://doi.org/10.1051/0004-6361/201527013
Ranalli P, Koulouridis E, Georgantopoulos I, Fotopoulou S, Hsu LT, Salvato M et al. The 2-10 keV unabsorbed luminosity function of AGN from the LSS, CDFS, and COSMOS surveys. Astronomy and Astrophysics. 2016 Jan 1;590. A80. https://doi.org/10.1051/0004-6361/201527013
Ranalli, P. ; Koulouridis, E. ; Georgantopoulos, I. ; Fotopoulou, S. ; Hsu, L. T. ; Salvato, M. ; Comastri, A. ; Pierre, M. ; Cappelluti, Nico ; Carrera, F. J. ; Chiappetti, L. ; Clerc, N. ; Gilli, R. ; Iwasawa, K. ; Pacaud, F. ; Paltani, S. ; Plionis, E. ; Vignali, C. / The 2-10 keV unabsorbed luminosity function of AGN from the LSS, CDFS, and COSMOS surveys. In: Astronomy and Astrophysics. 2016 ; Vol. 590.
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AU - Georgantopoulos, I.

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AU - Hsu, L. T.

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AU - Chiappetti, L.

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