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**TITLE** ASP Conference Series, Vol. **VOLUME**, **PUBLICATION YEAR** **EDITORS**

By Fabrizio Fiore, Giorgio Matt, Fabio La Franca, G. Cesare Perola, Universitá Roma Tre Roma, Marcella Brusa, Andrea Comastri, Marco Mignoli, Paolo Ciliegi, Paola Severgnini, Roberto Maiolino, Ro Baldi, Silvano Molendi and Cristian 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 × 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 ≈ 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. 1

Year: 2001
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