Other
Scientific paper
Feb 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...265..570s&link_type=abstract
Astrophysical Journal, Part 1, vol. 265, Feb. 1, 1983, p. 570-572.
Other
12
Active Galactic Nuclei, Cosmic Rays, Galactic Radiation, Flux Density, Galactic Clusters, Milky Way Galaxy, Protons
Scientific paper
The mean energy density of cosmic rays in the supercluster is determined. Developments in extragalactic cosmic rays since the study of Ginzburg and Syrovatskii (1972) are summarized, and order-of-magnitude estimates of extragalactic protons are made from observations of extensive air showers initiated by cosmic rays at energies above 10 to the 19th eV. Three arguments that these ultrahigh energy air showers are generated by extragalactic protons and other nuclei are stated. It is assumed that cosmic rays about 10 to the 19th eV are of extragalactic origin, and whether this energy density is consistent with the nonthermal energy output from extragalactic sources within the supercluster, and whether normal galaxies therein could provide this energy density, is investigated. A lower limit to the age of extragalactic cosmic rays of 50 million years is deduced, with an upper limit of slightly above 100 million years for the highest energy rays.
Shapiro Marjorie
Silberberg Rein
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