A ROSAT View of the Soft X-ray Background

Details A ROSAT View of the Soft X-ray Background A ROSAT View of the Soft X-ray Background

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...181.1801w&link_type=abstract

American Astronomical Society, 181st AAS Meeting, #18.01; Bulletin of the American Astronomical Society, Vol. 24, p.1148

Astronomy and Astrophysics

Astronomy

Scientific paper

An extensive study of the soft X-ray background has been carried out with observations from the ROSAT X-ray satellite. Detailed fluctuation and spectral analyses have shown that the background in the 0.5 - 2 keV band can be decomposed into two components with distinctly different origins (point-like vs diffuse) and spectral properties. We find that although ~ 90% of the background in the 0.9 - 2 keV band could be accounted for by discrete sources, e.g. AGNs and distant clusters of galaxies, the radiation in the 0.5 - 0.9 keV band arises primarily in a diffuse component, most likely representing the hot medium in the intergalactic space or in the halo around the Milky Way. The discrete source component is characterized by a power law of an index ~ 1.4 +/- 0.3 while the diffuse component can well be represented by an optically-thin thermal plasma of a temperature ~ 10(6.2) K.

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