Cosmic rays and gamma rays in early galaxian phases and the cosmic gamma-ray background

Details Cosmic rays and gamma rays in early galaxian phases and the cosmic gamma-ray background Cosmic rays and gamma rays in early galaxian phases and the cosmic gamma-ray background

Jun 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apjs...92..575p&link_type=abstract

The Astrophysical Journal Supplement Series, vol. 92, no. 2, p. 575-578

Astronomy and Astrophysics

Astrophysics

7

Background Radiation, Galactic Cosmic Rays, Galactic Radiation, Gamma Rays, Milky Way Galaxy, Spiral Galaxies, Emissivity, Flux Density, Galactic Evolution, Nuclear Fusion

Scientific paper

Recent observations of Be and B in old halo stars can be explained by models invoking large cosmic-ray fluxes in the early Galaxy. If this is a generic feature of early galaxian phases, large gamma-ray fluxes resulting from pion decay should have been produced at redshifts Z approximately 3-10. We estimate the evolution of the gamma-ray luminosity of spiral galaxies and their contribution to the cosmic gamma-ray background.

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