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29 March 2024
 
  » arxiv » 0710.0402

 Article overview


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
AbstractWe 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
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