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The Distribution of X-Ray Emitting Quasars in Space

Published online by Cambridge University Press:  19 July 2016

G. Setti
G. Setti*
Affiliation:
European Southern Observatory Karl-Schwarzschild-Str. 2, Garching bei München, FRG

Abstract

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This review is mainly concerned with the discussion of the statistical properties of X-ray and optically selected samples of quasars and Sy 1 nuclei and their intercomparison. The inconsistencies which have been found are clearly exemplified by the discrepancy between the observed and the predicted X-ray source counts. It is shown that a satisfactory understanding of these problems has not yet been reached. The last section deals with the long debated contribution of AGNs to the extragalactic X-ray background (XRB), which is still uncertain within a factor of 2, although a lower bound of 30% at the (now convenient) energy of 2 keV can be set.

Type
Chapter X: The Distribution of X-Ray Sources and the X-Ray Background
Information
Symposium - International Astronomical Union , Volume 124: Observational Cosmology , 1987 , pp. 579 - 592
Copyright
Copyright © Reidel 1987 

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