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spectrum of hard X-ray selected QSOs.

By G. C. Stewart, I. Georgantopoulos, R. E. Griffiths, B. J. Boyle and T. Shanks


It has been almost 40 years since Giacconi et al. (1962) discovered the X-ray Background (XRB), the first cosmic background detected. Nevertheless its origin is still not fully understood. At a flux limit of ∼ 10 −15 erg cm −2 s −1 70 −80 % o

Year: 2008
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