On the origin of the diffuse X-ray background

Details On the origin of the diffuse X-ray background On the origin of the diffuse X-ray background

Dec 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...347....1s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 347, Dec. 1, 1989, p. 1-10.

Other

8

Baryons, Cosmic X Rays, Cosmology, Dark Matter, Diffuse Radiation, Relic Radiation, Bremsstrahlung, High Temperature Plasmas, Intergalactic Media, Radiation Distribution, X Ray Spectra

Scientific paper

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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