Abstract Evidence on the energy spectrum, mass composition and anisotropy of cosmic rays above 1014 eV is briefly surveyed and it is shown that the data are consistent with all cosmic rays below 1019 eV being of galactic origin. Results from the new field of γ-ray astronomy above 1015 eV are described and implications for the origin of cosmic rays are discussed. It is argued that while shock acceleration can explain the cosmic ray beam below ∼2×1015 eV, the spectrum up to 1019 eV at the present time may be dominated by the output from a single accelerator (Cyg X-3 being the paradigm). Cosmic rays above 1019 eV are probably of extra-galactic origin.
Ultra high energy cosmic rays and ultra high energy γ-rays
Advances in Space Research ; 4 , 2-3 ; 35-44
1984-01-01
10 pages
Article (Journal)
Electronic Resource
English
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