Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...378..682h&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 378, Sept. 10, 1991, p. 682-686.
Astronomy and Astrophysics
Astrophysics
8
Gamma Ray Bursts, Magnetohydrodynamic Waves, Neutron Stars, Particle Acceleration, Stellar Atmospheres, Wave Propagation, Bremsstrahlung, Computerized Simulation, Kinetic Energy, Magnetic Stars, Particle Energy, Photons, Trapped Particles
Scientific paper
Simulations of strong compressional Alfven waves propagating through a nonuniform electron-positron atmosphere are carried out. It is shown that such waves can accelerate particles by magnetic trapping; as the density of the atmosphere decreases away from a star, the condition for trapping can be satisfied for an extended time, resulting in acceleration of some particles to high energies. The mechanism of phase-locked acceleration is found to naturally produce a fairly hard power-law spectrum when particle energy is converted to photons by bremsstrahlung. The photon spectra obtained from the present simple model can qualitatively reproduce several features of observed spectra. The mechanism can also account for the paucity of X-ray energy, relative to the energy in gamma-rays, that is observed in gamma-ray bursts.
Holcomb Katherine Ann
Tajima Toshiki
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