Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...318...93h&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 318, July 1, 1987, p. 93-102.
Astronomy and Astrophysics
Astrophysics
78
Background Radiation, Diffuse Radiation, Galactic Nuclei, Radiant Flux Density, X Ray Sources, Astronomical Spectroscopy, Heao 2, Point Sources, Quasars
Scientific paper
An analysis of the arcminute scale fluctuations in the extragalactic diffuse X-ray background has been undertaken using the Deep Survey data gathered by the Einstein Observatory. These data provide a direct measure of the relative contributions to the unresolved X-ray background of point sources and effectively diffuse emission. A sophisticated Monte Carlo scheme is used to compare the X-ray images with a variety of models representing point and diffuse source contributions. Results for two classes of models are described: those which determine the flux cutoff beyond which pointlike sources fail to contribute significantly if the log N - log S slope is fixed at the measured value of -1.5, and those which set limits on the slope of the log N - log S relation below its last measured point at the Deep Survey threshold. In both cases, the known population of X-ray emitting quasars and any reasonable extrapolations therefrom do not comprise the entire X-ray background.
Hamilton Thomas T.
Helfand David J.
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