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On the origin of the diffuse X-ray background
Subrahmanyan, R.; Cowsik, R.
AA(Tata Institute of Fundamental Research, Bombay, India), AB(Tata Institute of Fundamental Research, Ootacamund, India)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 347, Dec. 1, 1989, p. 1-10. (ApJ Homepage)
Publication Date:
NASA/STI Keywords:
Baryons, Cosmic X Rays, Cosmology, Dark Matter, Diffuse Radiation, Relic Radiation, Bremsstrahlung, High Temperature Plasmas, Intergalactic Media, Radiation Distribution, X Ray Spectra
Bibliographic Code:


The possibility that the diffuse X-ray background (XRB) could have been generated by the infall of baryons into the potential wells of dark matter is investigated within the framework of a hot dark matter (neutrino)-dominated universe. The XRB spectrum is fitted with the thermal bremsstrahlung kernel, and constraints on the nature of the infall and properties of the X-ray emitting gas are derived. The results indicate that around xi = 5 infall results in the formation of high-density knots with a hot plasma phase constituting 1 percent or less of the baryonic content of the universe. These dense regions can be regarded as the progenitors of present-day galaxies. Constraints are also derived for forms of dark matter other than neutrinos.

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