Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...235....4m&link_type=abstract
Astrophysical Journal, Part 1, vol. 235, Jan. 1, 1980, p. 4-10.
Astronomy and Astrophysics
Astronomy
321
Cosmic Rays, Diffuse Radiation, Intergalactic Media, X Ray Astronomy, X Ray Spectra, Background Radiation, Emission Spectra, Galactic Clusters, Heao 1, Rarefied Plasmas, Spectral Line Width
Scientific paper
The spectrum of the extragalactic diffuse X-ray background has been measured with the GSFC Cosmic X-ray Experiment on HEAO 1 for regions of the sky away from known point sources and more than 20 deg from the galactic plane. A total exposure of 80 sq m-s-sr is available at present. Free-free emission from an optically thin plasma of 40 plus or minus 5 keV provides an excellent description of the observed spectrum from 3 to 50 keV. This spectral shape is confirmed by measurements from five separate layers of three independent detectors. With an estimated absolute precision of about 10%, the intensity of the emission at 10keV is 3.2 keV/keV/sq cm/s/sr, a value consistent with the average of previously reported spectra. A uniform hot intergalactic medium of approximately 36% of the closure density of the universe would produce such a flux, although nonuniform models indicating less total matter are probably more realistic.
Boldt Elihu A.
Holt Stephen S.
Marshall Francis E.
Miller Richard B.
Mushotzky Richard F.
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