Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-06-01
Astronomy and Astrophysics
Astrophysics
to appear in the proceedings of 'Multiwavelength AGN surveys' (Cozumel, December 8-12 2003), ed. R. Maiolino and R. Mujica
Scientific paper
The fraction of the hard X-ray background (XRB) resolved into individual sources by the deep Chandra and XMM-Newton surveys strongly depends on the adopted energy range and decreases with increasing energy. As a consequence, the nature of the sources of the even harder (>10 keV) XRB remains observationally poorly constrained. I will briefly discuss the need for X-ray observations above 10 keV.
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