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The X-Ray Background from Star-Forming Galaxies

Published online by Cambridge University Press:  08 February 2017

Richard E. Griffiths
Richard E. Griffiths*
Affiliation:
Space Telescope Science Institute 3700 San Martin Drive Baltimore, MD 21218 USA

Extract

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It has been established observationally that at least 30% of the all-sky X-ray background (XRB) in the energy range of 1–3 keV comes from active galactic nuclei (AGN) in the redshift interval of 0.4 to 1.2 (Griffiths et al. 1983, 1988); it is also quite plausible that AGN contribute half of the XRB in the 1–3 keV range (Morisawa and Takahara 1989). However, analysis of spatial fluctuations in the Einstein deep survey counts (Hamilton and Helfand 1987; Barcons and Fabian 1989) has indicated the presence of a relatively smooth component of the XRB with a corresponding surface density of discrete sources of at least several thousand per square degree.

Type
IV. Extragalactic Background Radiation and Cosmology
Information
Symposium - International Astronomical Union , Volume 139: The Galactic and Extragalactic Background Radiation , 1990 , pp. 412 - 413
Copyright
Copyright © Kluwer 1990 

References

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