Annihilation radiation from a hot e/+/-e/-/ plasma

Details Annihilation radiation from a hot e/+/-e/-/ plasma Annihilation radiation from a hot e/+/-e/-/ plasma

Nov 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...250..384r&link_type=abstract

Astrophysical Journal, Part 1, vol. 250, Nov. 1, 1981, p. 384-388.

Astronomy and Astrophysics

Astrophysics

82

Electron-Positron Plasmas, Gamma Ray Bursts, High Temperature Plasmas, Line Spectra, Neutron Stars, Positron Annihilation, Electron Plasma, Emission Spectra, Energy Spectra, Monte Carlo Method, Particle Energy, Plasma Temperature

Scientific paper

The radiation from electron-positron annihilations in a plasma of temperature above 10 to the 8th K is investigated as a possible source of the emission line at energies between 400 and 460 keV frequently seen in gamma-ray bursts. The annihilation rate and luminosity of an optically thin electron-positron plasma and the energy distribution of the resulting annihilation radiation are calculated by the use of a Monte Carlo technique as functions of temperature. Results indicate the annihilation spectrum to be peaked at an energy of 0.511 MeV plus a temperature-dependent blueshift, and the annihilation line to be significantly temperature-broadened. The widths of the observed burst emission lines set an upper limit of 3 x 10 to the 8th K on the temperature of any pair annihilation region in burst sources, which is considerably lower than the typical kinetic temperatures of the radiating particles. It is thus inferred that either the annihilation region is nonthermal, or spatially distinct from the burst site.

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