A significant contribution to the cosmic X-ray background from sources associated with nearby galaxies

Details A significant contribution to the cosmic X-ray background from sources associated with nearby galaxies A significant contribution to the cosmic X-ray background from sources associated with nearby galaxies

Aug 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993natur.364..693l&link_type=abstract

Nature (ISSN 0028-0836), vol. 364, no. 6439, p. 693-695.

Astronomy and Astrophysics

Astronomy

36

Background Radiation, Cosmic X Rays, Energy Bands, Galactic Clusters, Red Shift, Astronomical Catalogs, Cross Correlation, Flux Density

Scientific paper

A revised limit on the local X-ray emissivity due to sources correlated with nearby galaxies is obtained. These results are extrapolated up to a redshift of about 5, and it is found that a smaller, but still significant, fraction of the X-ray background (30 +/- 15 percent) can be accounted for by these sources. Evolution of the source properties and/or a new population of sources at high redshift is required to explain the residual background emissions.

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