Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...405..559f&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 405, no. 2, p. 559-566.
Astronomy and Astrophysics
Astronomy
11
Beryllium, Boron, Dwarf Stars, Galactic Cosmic Rays, Milky Way Galaxy, Particle Flux Density, Abundance, Gamma Ray Astronomy, Halos, Metallicity, Neutrinos
Scientific paper
The recent observations of Be and B in metal-deficient halo dwarfs are used to constrain a 'bright phase' of enhanced cosmic-ray flux in the early Galaxy. Assuming that this Be and B arises from cosmic-ray spallation in the early Galaxy, limits are placed on the intensity of the early (Population II) cosmic-ray flux relative to the present (Population I) flux. A simple estimate of bounds on the flux ratio is 1 - 40. This upper bound would restrict galaxies like our own from producing neutrino fluxes that would be detectable in any currently proposed detectors. It is found that the relative enhancement of the early flux varies inversely with the relative time of enhancement. It is noted that associated gamma-ray production via pp - pi0 pp may be a significant contribution to the gamma-ray background above 100 MeV.
Fields Brian D.
Schramm David N.
Truran James W.
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