A fluctuation analysis of the X-ray background in the Einstein Observatory IPC

Details A fluctuation analysis of the X-ray background in the Einstein Observatory IPC A fluctuation analysis of the X-ray background in the Einstein Observatory IPC

Apr 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.243..366b&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 243, April 1, 1990, p. 366-371. Research supported by C

Mathematics

Probability

35

Background Radiation, Cosmic X Rays, Fluctuation Theory, Heao 2, Spatial Distribution, Universe, Energy Spectra, Probability Distribution Functions, Quasars

Scientific paper

An analysis of the spatial distribution of counts in the 1-3 keV energy band has been carried out for several deep Einstein Observatory IPC fields. A surface density of 18 sources/sq deg at the Deep Survey limit of 0.001 count/s, similar to that found directly by Giacconi et al. (1979), is confirmed and its uncertainty reduced. In agreement with previous work by Hamilton and Helfand (1987) evidence is found for a break in the source number-flux relation at a flux level a few times below the Deep Survey limit. Sources similar to those contributing to the present analysis produce only about 35-45 percent of the X-ray background in the 1-3 keV energy band.

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