Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980natur.284..534c&link_type=abstract
Nature, vol. 284, Apr. 10, 1980, p. 534-536.
Astronomy and Astrophysics
Astronomy
Background Radiation, Diffuse Radiation, Galactic Evolution, Gamma Ray Astronomy, Red Shift, Cosmic Rays, Gas Density, Interstellar Gas, Supernovae
Scientific paper
The intensity of the diffuse gamma-ray background is used in an attempt to set limits to the redshift of protogalaxy formation. Consideration is given to protogalaxy formation at redshifts less than 100, using a model in which cosmic rays from supernova explosions in protogalaxies produce gamma rays through the decay of neutral mesons produced in collisions with the interstellar gas and gamma rays propagate in a vacuum by thin target scattering. An expression relating the differential gamma-ray flux observed at a redshift of zero to the cosmic ray flux as a function of redshift and the presently observed cosmic ray flux is used to obtain a redshift of approximately four for the conversion of light gas into high energy particles at the time of protogalaxy formation, if the density of the universe was on the order of 10 to the -7th/cu cm. It is also noted that a gas density less than 10 to the -10th/cu cm or very low supernova cosmic ray production is required for a protogalactic formation redshift greater than 100.
Cavallo Giacomo
di Fazio A.
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