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Title: On the origin of the diffuse X-ray background
Authors: Swarup, G.
Subrahmanyan, Ravi
Keywords: baryons
cosmic x rays
dark matter
diffuse radiation
relic radiation
high temperature plasmas
intergalactic media
radiation distribution
x ray spectra
Issue Date: 1-Dec-1989
Publisher: American Astronomical Society
Citation: Astrophysical Journal, 1989, Vol.347, p1
Abstract: 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
Description: Restricted Access.
ISSN: 0004-637X
1538-4357 (Online)
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Copyright: 1989 American Astronomical Society
Appears in Collections:Research Papers (A&A)

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