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The XMM-Newton Wide-Field Survey in the COSMOS field (XMM-COSMOS): demography and multiwavelength properties of obscured and unobscured luminous AGN | | M. Brusa
; F. Civano
; A. Comastri
; T. Miyaji
; M. Salvato
; G. Zamorani
; N. Cappelluti
; F. Fiore
; G. Hasinger
; V. Mainieri
; A. Merloni
; A. Bongiorno
; P. Capak
; M. Elvis
; R. Gilli
; H. Hao
; K. Jahnke
; A.M. Koekemoer
; O. Ilbert
; E. Le Floc'h
; E. Lusso
; M. Mignoli
; E. Schinnerer
; J.D. Silverman
; E. Treister
; J.D. Trump
; C. Vignali
; M. Zamojski
; T. Aldcroft
; H. Aussel
; S. Bardelli
; M. Bolzonella
; A. Cappi
; K. Caputi
; T. Contini
; A. Finoguenov
; A. Fruscione
; B. Garilli
; C.D. Impey
; A. Iovino
; K. Iwasawa
; P. Kampczyk
; J. Kartaltepe
; J.P. Kneib
; C. Knobelm K. Kovac
; F. Lamareille
; J-F. Leborgne
; V. Le Brun
; O. Le Fevre
; S.J. Lilly
; C. Maier
; H.J. McCracken
; R. Pello
; Y-J Peng
; E. Perez-Montero
; L. de Ravel
; D. Sanders
; M. Scodeggio
; N.Z. Scoville
; M. Tanaka
; Y. Taniguchi
; L. Tasca
; S. de la Torre
; L. Tresse
; D. Vergani
; E. Zucca
; | | Date: |
16 Apr 2010 | | Abstract: | We report the final optical identifications of the medium-depth (~60 ksec),
contiguous (2 deg^2) XMM-Newton survey of the COSMOS field. XMM-Newton has
detected ~800 X-ray sources down to limiting fluxes of ~5x10^{-16},
~3x10^{-15}, and ~7x10^{-15} erg/cm2/s in the 0.5-2 keV, 2-10 keV and 5-10 keV
bands, respectively. The work is complemented by an extensive collection of
multi-wavelength data from 24 micron to UV, available from the COSMOS survey,
for each of the X-ray sources, including spectroscopic redshifts for ~50% of
the sample, and high-quality photometric redshifts for the rest. The XMM and
multiwavelength flux limits are well matched: 1760 (98%) of the X-ray sources
have optical counterparts, 1711 (~95%) have IRAC counterparts, and 1394 (~78%)
have MIPS 24micron detections. Thanks to the redshift completeness (almost
100%) we were able to constrain the high-luminosity tail of the X-ray
luminosity function confirming that the peak of the number density of
logL_X>44.5 AGN is at z~2. Spectroscopically-identified obscured and unobscured
AGN, as well as normal and starforming galaxies, present well-defined optical
and infrared properties. We devised a robust method to identify a sample of
~150 high redshift (z>1), obscured AGN candidates for which optical
spectroscopy is not available. We were able to determine that the fraction of
the obscured AGN population at the highest (L_X>10^{44} erg s^{-1}) X-ray
luminosity is ~15-30% when selection effects are taken into account, providing
an important observational constraint for X-ray background synthesis. We
studied in detail the optical spectrum and the overall spectral energy
distribution of a prototypical Type 2 QSO, caught in a stage transitioning from
being starburst dominated to AGN dominated, which was possible to isolate only
thanks to the combination of X-ray and infrared observations. | | Source: | arXiv, 1004.2790 | | Services: | Forum | Review | PDF | Favorites | |
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