A population of faint galaxies that contribute to the cosmic X-ray background

Details A population of faint galaxies that contribute to the cosmic X-ray background A population of faint galaxies that contribute to the cosmic X-ray background

Feb 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998natur.391..866u&link_type=abstract

Nature, vol. 391, p. 866

Astronomy and Astrophysics

Astronomy

64

Faint Objects, Active Galactic Nuclei, Cosmic X Rays, Background Radiation, Sky Surveys (Astronomy), Radiation Sources

Scientific paper

We report the results of a survey of the cosmic X-ray background 100 times more sensitive than previous studies in the 2-10 keV band. We find many faint resolved sources, whose integrated flux accounts for 30 per cent of the X-ray background in this energy range. The average spectrum of the resolved sources is harder than those of nearby bright active galactic nuclei and is close to the spectrum of the X-ray background radiation. This means that a new class of sources, with hard X-ray spectra, dominate the sky at photon energies above 2 keV.

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