Giorgio LANZUISI
(Harvard-Smithsonian Center for Astrophysics)
We present a detailed X-ray spectral analysis of the 400 brightest sources in the Candra COSMOS catalogue (Elvis et al. 2009) that present at least 80 total net counts in the 0.5-10 keV band.
We performed the spectral fitting assuming as underling model a simple power law modified by photoelectric absorption. All the available spectroscopic or photometric redshift are used in the spectral fit.
We analyzed the statistical distribution of the X-ray spectral properties in the sample (e.g. Nh and LX distribution, fraction of obscured sources) and their correlation with multiwavelenght properties.
We also performed a simultaneous spectral fitting with the XMM-Newton data for all the sources in common, in order to check for variability in flux and obscuration, and systematic differences in the constraint on spectral parameters.