Nonthermal synchrotron radiation and pair annihilation in gamma-ray bursts

Details Nonthermal synchrotron radiation and pair annihilation in gamma-ray bursts Nonthermal synchrotron radiation and pair annihilation in gamma-ray bursts

Dec 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...347.1128p&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 347, Dec. 15, 1989, p. 1128-1140.

Statistics

Computation

8

Annihilation Reactions, Gamma Ray Bursts, Neutron Stars, Pair Production, Synchrotron Radiation, Astronomical Spectroscopy, Compton Effect, Computational Astrophysics, Distribution Functions, Doppler Effect, Monte Carlo Method

Scientific paper

A self-consistent Monte Carlo simulation of quantized synchrotron emission, pair production, and pair annihilation in strong (2 x 10 to the 12th G or greater) magnetic fields is presented as a model of the production of annihilation lines in gamma-ray burst sources. The calculation determines the self-consistent photon spectrum and pair distribution functions resulting from a nonthermal injection of electrons into a region of homogeneous, strong magnetic field. The results indicate that the appearance of observable annihilation features in gamma-ray burst spectra requires isotropic or fan-beamed injection of electrons with energies of at least 5 MeV. The lines are narrow because higher energy electrons escape annihilation and do not contribute to Doppler-broadening. Injection beamed along the field did not produce observable annihilation lines in any of the cases studied. As a result, emission at energies much greater than 1 MeV produced through beaming seems to be incompatible with observable annihilation in this model. These results are discussed in relation to observed features in gamma-ray burst spectra.

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