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Article overview
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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 | Abstract: | The 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 | Services: | Forum | Review | PDF | Favorites |
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