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25 April 2024

» arxiv » astro-ph/0109116

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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 ;
Date:	7 Sep 2001
Subject:	astro-ph
Affiliation:	The Hellas2XMM collaboration
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.
Source:	arXiv, astro-ph/0109116
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