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Title:
The diffuse X-ray background spectrum from 3 to 50 keV
Authors:
Marshall, F. E.; Boldt, E. A.; Holt, S. S.; Miller, R. B.; Mushotzky, R. F.; Rose, L. A.; Rothschild, R. E.; Serlemitsos, P. J.
Affiliation:
AA(NASA, Goddard Space Flight Center, Laboratory for High Energy Astrophysics, Greenbelt, Md.), AB(NASA, Goddard Space Flight Center, Laboratory for High Energy Astrophysics, Greenbelt, Md.), AC(NASA, Goddard Space Flight Center, Laboratory for High Energy Astrophysics, Greenbelt, Md.), AD(NASA, Goddard Space Flight Center, Laboratory for High Energy Astrophysics, Greenbelt, Md.), AE(NASA, Goddard Space Flight Center, Laboratory for High Energy Astrophysics, Greenbelt, Md.), AF(NASA, Goddard Space Flight Center, Laboratory for High Energy Astrophysics, Greenbelt, Md.), AG(NASA, Goddard Space Flight Center, Laboratory for High Energy Astrophysics, Greenbelt, Md.), AH(NASA, Goddard Space Flight Center, Laboratory for High Energy Astrophysics, Greenbelt, Md.)
Publication:
Astrophysical Journal, Part 1, vol. 235, Jan. 1, 1980, p. 4-10. (ApJ Homepage)
Publication Date:
01/1980
Category:
Space Radiation
Origin:
STI
NASA/STI Keywords:
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
Comment:
A&AA ID. AAA027.142.001
DOI:
10.1086/157601
Bibliographic Code:
1980ApJ...235....4M

Abstract

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.

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