Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...213..287p&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 213, no. 1-2, April 1989, p. 287-290.
Astronomy and Astrophysics
Astrophysics
Energetic Particles, Particle Acceleration, Shock Wave Propagation, Solar Cosmic Rays, Energy Spectra, Interstellar Magnetic Fields, Milky Way Galaxy, Proton Energy
Scientific paper
A possibility of the extragalactic origin of ultra-high-energy cosmic rays is considered in the framework of the explosive galaxy formation scenario of Ostriker and Cowie (1981), who proposed that the formation of a 'cosmological shock wave' takes place as a result of the explosion of pregalactic objects with a mass of the order of 10 to the 11th solar mass. The energy available in these shocks is sufficient to account for the energy density of high-energy cosmic rays. However, the value of the maximum energy (Emax) gained by the cosmic rays, estimated using the method of Lagage and Cesarsky (1983) and the present value of the intergalactic magnetic field, was only Emax = 100,000 GeV, far below the energy range of high energy cosmic rays. It is suggested that the major reason for this is the low value of the magnetic field.
Lagage Pierre Olivier
Parvaneh D. L.
Schatzman Evry
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