Astronomy and Astrophysics – Astronomy
Scientific paper
May 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a....98...50b&link_type=abstract
Astronomy and Astrophysics, vol. 98, no. 1, May 1981, p. 50-56.
Astronomy and Astrophysics
Astronomy
6
Cosmic Rays, Cosmology, Galactic Evolution, Gamma Ray Astronomy, Neutrinos, Red Shift, Black Body Radiation, Brightness, Chronology, Electromagnetic Radiation, Pions, Secular Variations
Scientific paper
The possibility of using high-energy neutrinos as probes of the bright phase of galactic evolution believed to have followed directly from galaxy formation is considered. Constraints on the duration of the secular phase of galactic evolution following the bright phase posed by recent measurements of the diffuse component of gamma ray intensities at energies up to 200 MeV are discussed, and it is noted that these measurements are compatible with little secular evolution in galactic luminosity, indicating a more violent bright phase than previously believed. Attention is then given to the processes responsible for the generation of high energy neutrinos in the decays of pions produced in the interactions of ultra-high-energy protons with ambient gas or low-energy electromagnetic radiation in the bright phase of galactic evolution, and the expected flux of neutrinos with energies greater than 10 to the 15th eV created for the case when the bright phase took place at a redshift greater than 10 is calculated. It is found that the bright phase should be the most powerful source of high-energy neutrinos produced by cosmic ray interactions with the relic black-body radiation, with the differential neutrino spectrum having a maximum determined only by the redshift of the cosmic-ray producing epoch. The predicted neutrino fluxes are noted to be detectable by a DUMAND-type array, allowing the dating of the epoch of galaxy formation.
Berezinskii V. S.
Ozernoi L. M.
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