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J/A+A/557/A81 XMM-LSS field X-ray sources classification (Melnyk+, 2013)
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Beginning of ReadMe :J/A+A/557/A81 XMM-LSS field X-ray sources classification (Melnyk+, 2013)
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Classification and environmental properties of X-ray selected point-like sources
in the XMM-LSS field.
Melnyk O., Plionis M., Elyiv A., Salvato M., Chiappetti L., Clerc N.,
Gandhi P., Pierre M., Sadibekova T., Pospieszalska-Surdej A., Surdej J.
<Astron. Astrophys. 557, A81 (2013)>
=2013A&A...557A..81M
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ADC_Keywords: X-ray sources ; Active gal. nuclei ; QSOs ; Redshifts
Keywords: quasars: general - X-rays: general - galaxies: active -
X-rays: galaxies
Abstract:
The XMM-Large Scale Structure survey (XMM-LSS), covering an area of
11.1 sq. deg., contains more than 6000 X-ray point-like sources detected
with XMM-Newton to a flux of 3x10^-15^erg/s/cm^2^ in the [0.5-2]keV
band. The vast majority of these sources have optical (CFHTLS),
infrared (SWIRE IRAC and MIPS), near-infrared (UKIDSS) and/or
ultraviolet (GALEX) counterparts.
We wish to investigate the environmental properties of the different
types of the XMM-LSS X-ray sources by defining their environment using
the i'-band CFHTLS W1 catalog of optical galaxies to a magnitude limit
of 23.5mag.
We have classified 4435 X-ray selected sources on the basis of their
spectra, SEDs, and X-ray luminosity, and estimated their photometric
redshifts, which have a 4-11 band photometry with an accuracy of
sigma_dz_/(1+z_sp_)=0.076 with 22.6% outliers for i'<26mag. We
estimated the local overdensities of 777 X-ray sources that have
spectro-z or photo-z calculated by using more than seven bands
(accuracy of sigma_dz_/(1+z_sp_)=0.061 with 13.8% outliers) within the
volume-limited region defined by 0.1<z<0.85 and -23.5<M_i'_<-20.
Although X-ray sources may be found in variety of environments, a high
fraction ( 55-60%), as verified by comparing with the random
expectations, reside in overdense regions. The galaxy overdensities
within which X-ray sources reside show a positive recent redshift
evolution (at least for the range studied; z<0.85). We also find that
X-ray selected galaxies, when compared to AGN, inhabit significantly
higher galaxy overdensities, although their spatial extent appear to
be smaller than that of AGN. Hard AGN (HR>-0.2) are located in more
overdense regions than soft AGN (HR<-0.2), which is clearly seen in
both redshift ranges, although it appears to be stronger in the higher
redshift range (0.55<z<0.85). Furthermore, the galaxy overdensities
(with delta>1.5) within which soft AGN are embedded appear to evolve
more rapidly compared to the corresponding overdensities around hard
AGN.
Description:
Table 2 presents the spectroscopic and/or photometric redshifts for
5142 X-ray selected sources in the XMM-LSS field which have an optical
counterpart.