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The Origins of High-Energy Cosmic Rays

Published online by Cambridge University Press:  12 April 2016

W. I. Axford
W. I. Axford*
Affiliation:
Max Planck Institut für Aeronomie, D-37189 Katlenburg-Lindau, Germany

Abstract

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Our current understanding of acceleration processes for Galactic and extragalactic cosmic rays is briefly reviewed. Shock acceleration in supernova remnants remains the most favored process for cosmic rays up to the “knee” of the all-particle total energy spectrum at 1014 - 1015 eV. The highest energy particles are almost certainly extragalactic, and the most favored sources are associated with active galactic nuclei in one way or another. The intermediate region between rigidities of 1014 and 1018 V is more difficult to understand, although a galactic origin is preferred at present. The problem of making a smooth join in the spectrum at the knee suggests that these particles should not be considered to be independent of those at lower energies.

Subject headings: acceleration of particles — cosmic rays — shock waves

Type
Active Galaxies and Quasi-Stellar Objects
Information
International Astronomical Union Colloquium , Volume 142: Particle Acceleration Phenomena in Astrophysical Plasmas , 1994 , pp. 937 - 944
Copyright
Copyright © The American Astronomical Society 1994

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