Ultrahigh-energy cosmic-ray nuclei from black hole jets: Recycling galactic cosmic rays through shear acceleration

Shigeo S. Kimura, Kohta Murase, B. Theodore Zhang

Research output: Contribution to journalArticle

20 Scopus citations

Abstract

We perform Monte Carlo simulations of transrelativistic shear acceleration dedicated to a jet-cocoon system of active galactic nuclei. A certain fraction of galactic cosmic rays in a halo is entrained, and sufficiently high-energy particles can be injected to the reacceleration process and further accelerated up to 100 EeV. We show that the shear reacceleration mechanism leads to a hard spectrum of escaping cosmic rays, dLE/dE∞E-1-E0, distinct from a conventional E-2 spectrum. The supersolar abundance of ultrahigh-energy nuclei is achieved due to injections at TeV-PeV energies. As a result, we find that the highest-energy spectrum and mass composition can be reasonably explained by our model without contradictions with the anisotropy data.

Original languageEnglish (US)
Article number023026
JournalPhysical Review D
Volume97
Issue number2
DOIs
StatePublished - Jan 29 2018

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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