Energy spectra of cosmic rays accelerated at ultrarelativistic shock waves
Jun, 1998
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Abstract: (arXiv)
Energy spectra of particles accelerated by the first-order Fermi mechanism are investigated at ultrarelativistic shock waves, outside the range of Lorentz factors considered previously. For particle transport near the shock a numerical method involving small amplitude pitch-angle scattering is applied for flows with Lorentz factors from 3 to 243. For large shocks a convergence of derived energy spectral indices up to the value is observed for all considered turbulence amplitudes and magnetic field configurations. Recently the same index was derived for -ray bursts by Waxman [Astrophys. J. Lett. 485, L5 (1997)].Note:
- 4 pages, 6 figures Journal-ref: Phys.Rev.Lett. 80 (1998) 3911
- cosmic radiation: energy spectrum
- cosmic radiation: acceleration
- shock waves: relativistic
- photon: plasma
- magnetic field
- angular distribution
- numerical calculations: Monte Carlo
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