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Title:
Ultra high energy cosmic rays and the Galactic halo
Authors:
Benson, A.; Smialkowski, A.; Wolfendale, A. W.
Affiliation:
AA(Physics Department, University of Durham,Durham,, UK), AB(Physics Department, University of Lodz,Lodz,, Poland), AC(Physics Department, University of Durham,Durham,, UK)
Publication:
Astroparticle Physics, Volume 10, Issue 4, p. 313-320. (APh Homepage)
Publication Date:
05/1999
Origin:
ELSEVIER
DOI:
10.1016/S0927-6505(98)00065-6
Bibliographic Code:
1999APh....10..313B

Abstract

An analysis has been made of the fraction of ultra high energy cosmic rays (above 10^18 eV) which could be due to processes involved in two possible `Models'. The first is the Giant Magnetic Halo Model and the second is the Dark Matter Halo Model. We find that the former, in which heavy nuclei are trapped in a giant halo, fails for energies above about 3x10^19 eV. For the Dark Matter Halo Model, in which relic particles follow the ``conventional'' dark matter and whose decays give ultra high energy cosmic rays, the predicted anisotropies are much higher than those observed. The lack of observation of a finite flux from the Andromeda Galaxy means that the conclusion is insensitive to the spatial scale size of the assumed halo distribution. It is concluded that less than 10% of the ultra high energy cosmic rays come from relic particles in the Galactic halo.
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