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29 March 2024
 
  » arxiv » astro-ph/0203019

 Article overview


On the nature of X-ray Bright Optically Normal galaxies
A. Comastri ; M. Brusa ; P. Ciliegi ; M. Mignoli ; F. Fiore ; R. Maiolino ; P. Severgnini ; A. Baldi ; S. Molendi ; C. Vignali ; F. La Franca ; G. Matt ; G.C. Perola ;
Date 3 Mar 2002
Subject astro-ph
AffiliationOss. Astronomico-Bologna), M. Brusa (Dip. di Astronomia-Bologna), P. Ciliegi, M. Mignoli (Oss. Astronomico-Bologna), F. Fiore (Oss. Astronomico-Roma), R. Maiolino (Oss. Astrofisico di Arcetri-Firenze), P. Severgnini (Oss. Astronomico di Brera-Milano),
AbstractMultiwavelength observations of the hard X-ray selected sources by Chandra and XMM-Newton surveys have significantly improved our knowledge of the objects responsible of the hard X-ray background. A surprising finding is the discovery of a population of optically dull, X-ray bright galaxies emerging at 2-10 keV fluxes of the order of 10^{-14} erg cm^{-2} s^{-1}. We present preliminary results of multiwavelength observations of a few objects serendipitously discovered in the field of XMM-Newton and Chandra observations and intensively studied at longer wavelengths.
Source arXiv, astro-ph/0203019
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