Fluctuation analyses of the X-ray background

Details Fluctuation analyses of the X-ray background Fluctuation analyses of the X-ray background

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993adspr..13..253b&link_type=abstract

Advances in Space Research (ISSN 0273-1177), vol. 13, no. 12, p. (12)253-(12)259

Astronomy and Astrophysics

Astronomy

2

Background Radiation, Flux Density, Sky Surveys (Astronomy), Statistical Analysis, Variations, X Ray Astronomy, Active Galactic Nuclei, Ginga Satellite, Heao 2, Rosat Mission, X Ray Imagery

Scientific paper

We review recent progress in the use of analyses of fluctuations in the cosmic X-ray background (XRB) to determine the source counts below the detection thresholds. Three flux domains are discussed: the range around 10-12erg/((sq cm)(s)) where the Ginga and Einstein Observatory (HEAO 2) results remain inconsistent unless the sources at these fluxes (mainly Seyfert galaxies) are highly absorbed at low energies, the 10-14erg/((sq cm)(s)) zone where the flattening of the source counts predicted by fluctuation analyses of Einstein Observatory images is now confirmed by Rosat and the 10-15erg/((sq cm)(s)) flux domain, where fluctuation analyses of Rosat images show that source counts remain sub-Euclidean with very little contribution to the XRB coming from these sources.

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