Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-03-03
Astronomy and Astrophysics
Astrophysics
6 pages, 6 figures. Oral contribution to "New Visions of the X-ray Universe in the XMM-Newton and Chandra Era", 26-30 November
Scientific paper
Multiwavelength 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.
Baldi Alessandro
Brusa Marcella
Ciliegi Paolo
Comastri Andrea
Fiore Fabrizio
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