Irregularities in the X-ray background

Details Irregularities in the X-ray background Irregularities in the X-ray background

Jun 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980phys...21..644s&link_type=abstract

(University of Copenhagen, Danish Research Council and Nordisk Institut for Teoretisk Atomfysik, Copenhagen Symposium on the Uni

Physics

14

Background Radiation, Cosmic X Rays, Cosmology, Diffuse Radiation, Galactic Radiation, X Ray Sources, Angular Distribution, Brightness, Compton Effect, Surface Properties, Universe

Scientific paper

The X-ray background is a unique tool in having its origin in the redshift range of about unity, and in the availability of all sky coverage. The paper reviews the measurements of isotropy and compares them to what is known about the origin of the X-ray background in terms of discrete sources, a galactic component, and a possible 'truly diffuse' metagalactic emission. Only the 2-10 keV X-ray range is considered in detail. Four irregularities in the distribution of the 2-10 keV X-ray background are identified, three of them being in the angular distribution of surface brightness. Recent results from the Einstein X-ray Observatory have revealed the fourth irregularity, namely, that the extragalactic sources evolve strongly so that half the background arises from beyond a redshift of unity.

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