The Extragalactic X-Ray Background

ROSAT Observations
  • G. Hasinger
Part of the Astrophysics and Space Science Library book series (ASSL, volume 187)


This review describes the most recent advances in the study of the extragalactic soft X-ray background and what we can learn about its constituents. The deepest pointed observations with the ROSAT PSPC are discussed. The logN-logS relation is presented, which reaches to the faintest X-ray fluxes and to the highest AGN surface densities ever achieved. The N(>S) relation shows a density in excess of 400 deg-2 at the faintest fluxes and a flattening below the Einstein Deep Survey limit. About 60% of the extragalactic background has been resolved in the deepest field. Detailed source spectra and first optical and radio identifications will be discussed. The results are put into perspective of the higher energy X-ray background.

Key words

X-rays background radiations active galactic nuclei 


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Copyright information

© Springer Science+Business Media Dordrecht 1994

Authors and Affiliations

  • G. Hasinger
    • 1
  1. 1.Max-Planck-Institut für extraterrestrische PhysikGarchingGermany

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