Astronomy and Astrophysics – Astronomy
Scientific paper
May 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986mnras.220..439g&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 220, May 15, 1986, p. 439-451. Research supported by th
Astronomy and Astrophysics
Astronomy
63
Background Radiation, High Temperature Plasmas, Intergalactic Media, X Ray Spectra, Bremsstrahlung, Compton Effect, Gas Density, Microwave Spectra
Scientific paper
The possibility that a hot intergalactic medium produces the 5-200 keV X-ray background, including relativistic corrections for the gas emissivity and thermodynamics and Compton scattering on the microwave background, is reinvestigated. It is shown that thermal bremsstrahlung provides an accurate fit to the observed X-ray spectrum, provided the gas was heated at a redshift of less than 6. The microwave background develops a high-energy tail, due to Compton scattering, which may contribute a significant fraction of the infrared background at 100 microns. Despite being the only physical model that adequately explains the spectrum of the X-ray background, the enormous total energy required is a severe problem. The gas density estimated is reduced by a factor of 2 below that obtained by previous workers and, if uniform, is too large to be consistent with current estimates of the cosmic abundance of deuterium. Small-scale clumping of the gas can overcome this discrepancy if there is pressure confinement by a yet-hotter, lower density medium.
Fabian Andrea C.
Guilbert Paul W.
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