Mathematics – Logic
Scientific paper
Mar 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980stin...8023247b&link_type=abstract
Presented at the 155th Meeting, Am. Astron. Soc., San Francisco, 15 Jan. 1980
Mathematics
Logic
Cosmic X Rays, Extraterrestrial Radiation, Heao, Intergalactic Media, Spaceborne Experiments, Active Galaxies, Bremsstrahlung, Broadband, Gamma Rays, Spectrum Analysis, X Ray Sources, X Ray Spectra
Scientific paper
The cosmic X-ray experiment carried out with the A2 Instrument on HEAO-1 made systematics-free measurements of the extra-galactic X-ray sky and yielded the broadband spectral characteristics for two extreme aspects of this radiation. For the apparently isotropic radiation of cosmological origin that dominates the extragalactic X-ray flux ( 3 keV), the spectrum over the energy band of maximum intensity is remarkably well described by a thermal model with a temperature of a half-billion degrees. At the other extreme, broadband observations of individual extragalactic X-ray sources with HEAO-1 are restricted to objects within the present epoch. While the non-thermal hard spectral components associated with unevolved X-ray emitting active galaxies could account for most of the gamma-ray background, the contribution of such sources to the X-ray background must be relatively small. In contrast, the 'deep-space' sources detected in soft X-rays with the HEAO-2 telescope probably represent a major portion of the extragalactic soft X-ray ( 3 keV) background.
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