Abstract
The nature of discrete x-ray sources contributing to the all-sky x-ray background has been investigated. X-ray selected quasars account directly for ~ 30% of the all-sky x- ray background in the energy range of the Einstein Observatory. Quasars which were not detected in x-rays may account for a further 10–20% of the x-ray background. No examples have yet been found of any class of sources, other than quasars, which might make a comparable or substantial contribution to the extragalactic x-ray background.
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Griffiths, R.E., Tuohy, I.R., Brissenden, R.J.V., Ward, M., Murray, S.S., Burg, R. (1988). Quasars Contributing to the Extragalactic X-Ray Flux: The Deep X-Ray Survey in Pavo. In: Kaiser, N., Lasenby, A.N. (eds) The Post-Recombination Universe. NATO ASI Series, vol 240. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-3035-3_7
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DOI: https://doi.org/10.1007/978-94-009-3035-3_7
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