Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-11-14
Astronomy and Astrophysics
Astrophysics
4 pages, 3 figures. Proc. workshop "X-ray surveys in the light of the new observatories", to be published in AN. LaTeX, an.cls
Scientific paper
Extensive programs of follow-up observations of hard X-ray selected sources have unambiguosly revealed that the sources of the X-ray background are characterized by an extremely large dispersion in their optical magnitude and spectroscopic classification. Here we present the results of an attempt to understand the nature of the observed variety using a simple prescription for their optical to X-ray energy distribution.
Brusa Marcella
collaboration the HELLAS2XMM
Comastri Andrea
Mignoli Marco
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