Neutrino dating of the epoch of galaxy formation

Details Neutrino dating of the epoch of galaxy formation Neutrino dating of the epoch of galaxy formation

Jun 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981azh....58..505b&link_type=abstract

Astronomicheskii Zhurnal, vol. 58, May-June 1981, p. 505-515. In Russian.

Astronomy and Astrophysics

Astronomy

2

Cosmology, Energetic Particles, Galactic Evolution, Gamma Rays, Neutrino Beams, Relic Radiation, Background Radiation, Black Body Radiation, Cosmic Rays, Diffuse Radiation, Galactic Nuclei, Galactic Radiation, Interstellar Gas, Luminosity, Particle Energy, Red Shift

Scientific paper

It is shown that high-energy neutrinos can be a good tool for investigating the earliest stages of the evolution of galaxies. Neutrino data indicate that galaxy evolution can be divided into a bright phase and a phase of secular evolution; the bright phase was apparently a characteristic feature not only of stellar populations but also of nonstellar active sources in galactic nuclei. New data on the isotropic gamma-ray background at energies of the order of 200 MeV make doubtful the existence of a significant secular evolution of galaxy luminosity in cosmic rays. The bright phase appears to be the most powerful source of high-energy neutrinos produced in interactions of cosmic rays with interstellar gas and relict blackbody radiation. The differential spectrum of neutrinos has a maximum at an energy that is determined only by the red shift of the epoch of cosmic ray production; this fact confirms the usefulness of neutrino dating of the formation of galaxies.

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