Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984xue..conf..232f&link_type=abstract
In Max-Planck Inst. für Physik und Astrophysik X-Ray and UV Emission from Active Galactic Nuclei p 232-242 (SEE N85-17790 08-88)
Astronomy and Astrophysics
Astrophysics
3
Background Radiation, Cosmic X Rays, Extragalactic Radio Sources, Galactic Radiation, X Ray Spectra, Active Galactic Nuclei, Bremsstrahlung, Cosmic Plasma, Diffuse Radiation, Intergalactic Media, Quasars
Scientific paper
Data on the 0 to 50 keV X-ray background are reviewed. The spectrum of the X-ray background fits a thermal bremsstrahlung model remarkably well. This raises the possibility that most of the background is diffuse and originates in a hot intergalactic plasma. Contributions by point sources need not exceed 20% above 3 keV. Below 1 keV, the X-ray background is dominated by a galactic contribution due in part to a combination of hot gas and stars. The spectrum in the range 1 to 3 keV is uncertain. A galactic contribution amounting to a few percent is also observed in the 2 to 10 keV range, possibly due to inverse Compton scattering of starlight by low energy cosmic-ray electrons. The remaining background is highly isotropic, with any fluctuations remaining after accounting for observed classes of sources being 2% on scales of 25 sq deg. An additional component becomes apparent in the spectrum above 100 keV, leading to the MeV bump, possibly due to active galactic nuclei.
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