Galactic Cosmic Ray Acceleration with Steep Spectra

  title={Galactic Cosmic Ray Acceleration with Steep Spectra},
  author={R. Diesing and Damiano Caprioli},
  journal={Proceedings of 37th International Cosmic Ray Conference — PoS(ICRC2021)},
  • R. Diesing, D. Caprioli
  • Published 16 September 2021
  • Physics
  • Proceedings of 37th International Cosmic Ray Conference — PoS(ICRC2021)
Galactic cosmic rays (CRs) are accelerated by astrophysical shocks, primarily supernova remnants (SNRs), via diffusive shock acceleration (DSA), an efficient mechanism that predicts power-law energy distributions of CRs. However, observations of both nonthermal SNR emission and Galactic CRs imply CR spectra that are steeper than the standard DSA prediction, ∝ E−2. Recent kinetic hybrid simulations suggest that such steep spectra may be the result of a “postcursor”, or drift of CRs and magnetic… 

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