Particle acceleration at ultra-relativistic shocks. Gamma-ray burst afterglow spectra and UHECRs

Details Particle acceleration at ultra-relativistic shocks. Gamma-ray burst afterglow spectra and UHECRs Particle acceleration at ultra-relativistic shocks. Gamma-ray burst afterglow spectra and UHECRs

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26as..138..549g&link_type=abstract

Astronomy and Astrophysics Supplement, v.138, p.549-550

Astronomy and Astrophysics

Astrophysics

40

Acceleration Of Particles, Relativity, Shock Waves, Gamma-Rays: Bursts, Cosmic Rays

Scientific paper

We consider particle acceleration of the Fermi type at the ultra-relativistic shock bounding an expanding relativistic fireball. We distinguish between the initial shock crossing cycle, in which particles can gain a large factor in energy, and subsequent crossing cycles, where the energy typically only doubles. We show that repeated shock crossings yield a power-law spectrum of accelerated particles with index p ~ 2.2-2.3, compatible with afterglow observations. We suggest that ultra-high-energy cosmic rays (UHECRs) might be produced by the initial boost in a relativistic fireball expanding into a pulsar wind bubble created by the progenitor system.

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