Optical identification of sources from the HELLAS2XMM survey
F. Fiore, G. Matt, F. La Franca, G. C. Perola, M. Brusa, A. Comastri, M. Mignoli, P. Ciliegi, P. Severgnini, R. Maiolino, A. Baldi, S. Molendi, C. Vignali
Abstract
We present preliminary results on the optical identifications of sources from the High Energy Large Area Survey performed with XMM-Newton (HELLAS2XMM). This survey covers about 3 square degrees of sky down to a 2-10 keV flux of 7 x 10-15 erg cm-2 s-1 (Baldi & Molendi these proceedings, Baldi et al. 2001). The survey good sensitivity over a large area allows us to confirm and extend previous Chandra results about a population of X-ray luminous but optically dull galaxies emerging at 2-10 keV fluxes of about 10-14 erg cm-2 s-1. Although the statistics are still rather poor, it appears that at these X-ray fluxes the fraction of these galaxies is similar or even higher than that of narrow line AGN.
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