SIMBAD references

2007A&A...476.1191B - Astronomy and Astrophysics, volume 476, 1191-1203 (2007/12-4)

The XMM-Newton serendipitous survey. IV. Optical identification of the XMM-Newton medium sensitivity survey (XMS).

BARCONS X., CARRERA F.J., CEBALLOS M.T., PAGE M.J., BUSSONS-GORDO J., CORRAL A., EBRERO J., MATEOS S., TEDDS J.A., WATSON M.G., BASKILL D., BIRKINSHAW M., BOLLER T., BORISOV N., BREMER M., BROMAGE G.E., BRUNNER H., CACCIANIGA A., CRAWFORD C.S., CROPPER M.S., DELLA CECA R., DERRY P., FABIAN A.C., GUILLOUT P., HASHIMOTO Y., HASINGER G., HASSALL B.J.M., LAMER G., LOARING N.S., MACCACARO T., MASON K.O., McMAHON R.G., MIRIONI L., MITTAZ J.P.D., MOTCH C., NEGUERUELA I., OSBORNE J.P., PANESSA F., PEREZ-FOURNON I., PYE J.P., ROBERTS T.P., ROSEN S., SCHARTEL N., SCHURCH N., SCHWOPE A., SEVERGNINI P., SHARP R., STEWART G.C., SZOKOLY G., ULLAN A., WARD M.J., WARWICK R.S., WHEATLEY P.J., WEBB N.A., WORRALL D., YUAN W. and ZIAEEPOUR H.

Abstract (from CDS):

X-ray sources at intermediate fluxes (a few x10–14erg/cm2/s) with a sky density of ∼100deg–2 are responsible for a significant fraction of the cosmic X-ray background at various energies below 10keV. The aim of this paper is to provide an unbiased and quantitative description of the X-ray source population at these fluxes and in various X-ray energy bands. 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 (0.5-2keV), intermediate (0.5-4.5keV), hard (2-10keV) and ultra-hard (4.5-7.5keV) 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 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.

Abstract Copyright:

Journal keyword(s): X-rays: general - X-rays: galaxies - X-rays: stars - galaxies: active

VizieR on-line data: <Available at CDS (J/A+A/476/1191): table2.dat table5.dat>

Nomenclature: Table 2: XMS JHHMMSS.s+DDMMSS N=318.

Simbad objects: 343

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2020.02.24-00:49:29

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