The physical state of the intergalactic medium

Details The physical state of the intergalactic medium The physical state of the intergalactic medium

Apr 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991natur.350..685b&link_type=abstract

Nature (ISSN 0028-0836), vol. 350, April 25, 1991, p. 685-687.

Mathematics

Logic

33

Galactic Clusters, Galactic Evolution, Galactic Structure, Intergalactic Media, Baryons, Black Body Radiation, Neutral Gases, Relic Radiation

Scientific paper

Observational limits on the density of neutral hydrogen in the intergalactic medium (IGM), on the lack of deviations from a blackbody spectrum of the CMB, and on the extragalactic component of the soft X-ray background are used here to constrain the physical state of the IGM. From the lack of CMB fluctuations, any energetic IGM is inferred to be smoothly distributed on scales greater than galactic. This rules out hot IGM models for the origin of the hard X-ray background, as well as the hypothesis that cosmic explosions may have given rise to cosmological structure on scales larger than galaxies.

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