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Cosmic-ray spectral anomaly at GeV-TeV energies as due to re-acceleration by weak shocks in the Galaxy
Radboud University Nijmegen, The Netherlands.
Radboud University Nijmegen, The Netherlands ; Science Park Amsterdam, The Netherlands.
2013 (English)In: Proceedings of the 33rd International Cosmic Rays Conference: The Astroparticle Physics Conference, 2013, 1-4 p.Conference paper, Published paper (Refereed)
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Text
Abstract [en]

Recent cosmic-ray measurements by the ATIC, CREAM and PAMELA experiments have found an apparent hardening of the energy spectrum at TeV energies. Although the origin of the hardening is not clearly understood, possible explanations include hardening in the cosmic-ray source spectrum, changes in the cosmic-ray propagation properties in the Galaxy and the effect of nearby sources. In this contribution, we propose that the spectral anomaly might be an effect of re-acceleration of cosmic rays by weak shocks in the Galaxy. After acceleration by strong supernova remnant shock waves, cosmic rays undergo diffusive propagation through the Galaxy. During the propagation, cosmic rays may again encounter expanding supernova remnant shock waves, and get re-accelerated. As the probability of encountering old supernova remnants is expected to be larger than the young ones due to their bigger size, re-acceleration is expected to be produced mainly by weaker shocks. Since weaker shocks generate a softer particle spectrum, the resulting re-accelerated component will have a spectrum steeper than the initial cosmic-ray source spectrum produced by strong shocks. For a reasonable set of model parameters, it is shown that such re-accelerated component can dominate the GeV energy region while the non-reaccelerated component dominates at higher energies, explaining the observed GeV-TeV spectral anomaly.

Place, publisher, year, edition, pages
2013. 1-4 p.
Keyword [en]
Astrophysics, High Energy Astrophysical Phenomena
National Category
Astronomy, Astrophysics and Cosmology
Research subject
Physics, Astroparticle Physics
Identifiers
URN: urn:nbn:se:lnu:diva-51557OAI: oai:DiVA.org:lnu-51557DiVA: diva2:915321
Conference
International Cosmic Rays Conference, Rio De Janeiro, 2013
Available from: 2016-03-29 Created: 2016-03-29 Last updated: 2016-04-05Bibliographically approved

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Thoudam, Satyendra
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CiteExportLink to record
Permanent link

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Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf