Pair annihilation in wind models of gamma-ray bursts

Details Pair annihilation in wind models of gamma-ray bursts Pair annihilation in wind models of gamma-ray bursts

Sep 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aipc..265..257c&link_type=abstract

Gamma-ray bursts. AIP Conference Proceedings, Volume 265, pp. 257-261 (1991).

Computer Science

Gamma-Ray Sources, Gamma-Ray Bursts, Neutron Stars, Elementary Particle Processes

Scientific paper

In wind models of γ-ray bursts, electron-position pairs stream away from the neutron star surface, upscattering soft x-ray photons to hard x- and γ-ray energies. For sufficiently high source luminosities, the density of pairs required is high enough that significant pair annihilation occurs before the pairs leave the continuum-forming region. We examine the effects of annihilation on the outflowing pair distribution using accurate (weak magnetic field) cross-sections. We compute the annihilation feature produced and conclude it should not be easily observable for source distances >~100 kpc. We also examine the validity of the single scattering approximation often made in continuum and dynamic cyclotron line-formation calculations. Even with the inclusion of annihilation which removes pairs from the wind, we find that a photon is likely to scatter several times off the wind if the source is at a distance >~1 kpc. This can significantly modify the computed spectrum.

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