The origin of the diffuse X-ray background and the formation of galaxies and voids

Details The origin of the diffuse X-ray background and the formation of galaxies and voids The origin of the diffuse X-ray background and the formation of galaxies and voids

Nov 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...322...20d&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 322, Nov. 1, 1987, p. 20-33. Research supported by Boston University.

Astronomy and Astrophysics

Astrophysics

18

Astronomical Models, Background Radiation, Diffuse Radiation, Galactic Evolution, Void Ratio, X Ray Sources, Cosmology, Density Distribution, Galactic Structure, Shock Waves

Scientific paper

A new paradigm to explain how galaxies and voids formed is considered. In this model, dark matter and hydrogen form massive gravitationally bound condensates. The virial temperature of the hydrogen in these condensates is comparable to that necessary to produce the X-ray background from 5 to 200 keV, and the integrated emission matches that observed for reasonable parameter choices. The dark matter decays and the gas expands outward. Forward and reverse shocks separated by a contact discontinuity result when the expanding gas collides with matter still collapsing toward the condensate. Galaxy formation is triggered in the high-density region between the two shock fronts; a Jeans mass of about a trillion solar masses is obtained for this gas. The shock system overtakes the Hubble flow and may collide with that of its neighbor. The final configuration is a pattern of roughly spherical voids with luminous galaxies in thin shells and filaments.

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