Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998astl...24..139z&link_type=abstract
Astronomy Letters, Volume 24, Issue 2, March 1998, pp.139-143; Pis'ma v Astronomicheskii Zhurnal, Vol. 24, p. 172
Astronomy and Astrophysics
Astronomy
14
Scientific paper
The trajectories of ultra-high-energy particles in the irregular and regular Galactic magnetic fields are calculated numerically. It is shown that the body of the observational data on the energy spectrum, chemical composition, and upper limits on the anisotropy of cosmic rays can be explained in terms of a purely Galactic model for the origin of cosmic rays and in terms of a mixed model (Galactic and metagalactic components). In the purely Galactic model, the sources have a power-law spectrum at E <~ 10^20 with the spectral index = 2.2 and a `normal' chemical composition. In the mixed model, the Galactic sources have the spectral index = 2.5 at E <~ 10^18 eV and are enriched in heavy elements. The metagalactic component exhibits a flatter spectrum and contains mostly protons of energy E <~ 10^20 eV. The final choice between the models could be made on the basis of new measurements of the anisotropy of cosmic rays.
Pochepkin D. N.
Ptuskin Vladimir S.
Rogovaya S. I.
Zirakashvili Vladimir N.
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