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08 February 2025
 
  » arxiv » 1109.0076

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Cosmic ray spectral hardening due to dispersion of source injection spectra
Qiang Yuan ; Bing Zhang ; Xiao-Jun Bi ;
Date 1 Sep 2011
AbstractThe cosmic ray (CR) energy spectra measured with ATIC, CREAM and PAMELA showed that there is remarkable hardening for rigidity of several hundred GV. We propose that this hardening is due to the superposition of spectra from a population of sources, e.g., supernova remnants (SNRs), whose injection spectral indices have a dispersion. Adopting proper model parameters the observational data can be well explained. It is interesting that the injection source parameters are similar with that derived from gamma-ray observations of SNRs, which may support the SNR-origin of CRs. Furthermore this mechanism provides an alternative explanation of the "ankle-cutoff" structure of the ultra high energy CR spectra.
Source arXiv, 1109.0076
Other source [GID 1388121] 1104.3357
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