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Durham University

Department of Physics

Staff profile

Publication details for Prof Sir Arnold Wolfendale

Erlykin, AD & Wolfendale, AW (2002). Supernova remnants and the origin of the cosmic radiation: the electroncomponent. Journal Of Physics G-nuclear And Particle Physics 28(3): 359-378.
  • Publication type: Journal Article
  • ISSN/ISBN: 0954-3899
  • Keywords: SHOCK ACCELERATION; RAY POSITRONS; SPECTRA; PROPAGATION; GALAXY

Author(s) from Durham

Abstract

The model adopted by us in previous work (Erlykin A D and Wolfendale A
W 2001a, 2001b, 2001c involving the production of cosmic rays by
supernova remnant (SNR) shocks has been used to make predictions for
the electron component. It is found that the well-known low e/p ratio
(similar to1% at 10 GeV), and a somewhat steeper electron spectrum,
even in the energy region where energy losses due to synchrotron and
inverse Compton processes-are small, follows if it is assumed that the
injection efficiency falls with increasing Mach number of the shock.
It must be stated, however, that the Mach number argument is not firmly
based; nevertheless if it is not a Mach number effect, it is something
that simulates it.
Irrespective of the validity of the injection efficiency arguments, the
Monte Carlo calculations of cosmic ray propagation from randomly
distributed SNR have validity, it is found that electron energies just
above the maximum of those detected experimentally are needed in order
to check on the predictions of our 'single source model', which we
claim has particular relevance in the case of the more massive cosmic
rays.
A brief discussion of the relevance of our arguments to electrons in
other galactic and extragalactic environments is given.