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The XMM-Newton Serendipitous Survey V. Optical identification of the XMM-Newton Medium sensitivity Survey (XMS) | X. Barcons
; F. J. Carrera
; M. T. Ceballos
; M. J. Page
; J. Bussons-Gordo
; A. Corral
; J. Ebrero
; S. Mateos
; J. A. Tedds
; M. G. Watson
; M. Birkinshaw
; T. Boller
; N. Borisov
; M. Bremer
; G. E. Bromage
; H. Brunner
; A. Caccianiga
; C. S. Crawford
; M. S. Cropper
; R. Della Ceca
; P. Derry
; A. C. Fabian
; P. Guillout
; Y. Hashimoto
; G. Hasinger
; B. J. M. Hassall
; G. Lamer
; N. S. Loaring
; T. Maccacaro
; K. O. Mason
; R. G. McMahon
; L. Mirioni
; J. P. D. Mittaz
; C. Motch
; I. Negueruela
; J. P. Osborne
; F. Panessa
; I. Perez-Fournon
; J. P. Pye
; T. P. Roberts
; S. Rosen
; N. Schartel
; N. Schurch
; A. Schwope
; P. Severgnini
; R. Sharp
; G. C. Stewart
; G. Szokoly
; A. Ullan
; M. J. Ward
; R. S. Warwick
; P. J. Wheatley
; N. A. Webb
; D. Worrall
; W. Yuan
; H. Ziaeepour
; | Date: |
2 Oct 2007 | Abstract: | We present the XMM-Newton Medium sensitivity Survey (XMS), including a total
of 318 X-ray sources found among the serendipitous content of 25 XMM-Newton
target fields. The XMS comprises four largely overlapping source samples
selected at soft (0.5-2 keV), intermediate (0.5-4.5 keV), hard (2-10 keV) and
ultra-hard (4.5-7.5 keV) bands, the first three of them being flux-limited. We
report on the optical identification of the XMS samples, complete to 85-95%. At
the intermediate flux levels sampled by the XMS we find that the X-ray sky is
largely dominated by Active Galactic Nuclei. The fraction of stars in soft
X-ray selected samples is below 10%, and only a few per cent for hard selected
samples. We find that the fraction of optically obscured objects in the AGN
population stays constant at around 15-20% for soft and intermediate band
selected X-ray sources, over 2 decades of flux. The fraction of obscured
objects amongst the AGN population is larger (~35-45%) in the hard or
ultra-hard selected samples, and constant across a similarly wide flux range.
The distribution in X-ray-to-optical flux ratio is a strong function of the
selection band, with a larger fraction of sources with high values in hard
selected samples. Sources with X-ray-to-optical flux ratios in excess of 10 are
dominated by obscured AGN, but with a significant contribution from unobscured
AGN. | Source: | arXiv, 0710.0402 | Services: | Forum | Review | PDF | Favorites |
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