Acceleration of cosmic rays

Details Acceleration of cosmic rays Acceleration of cosmic rays

Jul 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008jphcs.120f2003b&link_type=abstract

Journal of Physics: Conference Series, Volume 120, Issue 6, pp. 062003 (2008).

Physics

Scientific paper

Cosmic ray (CR) origin problem is briefly discussed. It is argued that CRs with energies up to 1017 eV are produced in galactic supernova remnants, whereas ultra high energy CRs are extragalactic. CR composition strongly changes within the transition from galactic to extragalactic CR component, therefore precise measurements of CR composition at energies 1017 - 1019 eV are needed for the reliable determination of this transition. The possible sources of extragalactic CRs are briefly discussed. It is argued that CR acceleration at the shock created by the expanding cocoons around active galactic nuclei has to be considered as a prime candidate for the sources of extragalactic CRs.

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