Unthermalized plasma in bursts sources

Details Unthermalized plasma in bursts sources Unthermalized plasma in bursts sources

Aug 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985icrc....1...15t&link_type=abstract

In NASA. Goddard Space Flight Center 19th Intern. Cosmic Ray Conf., Vol. 1 p 15-18 (SEE N85-33902 22-93)

Physics

Annihilation Reactions, Energy Spectra, Gamma Ray Bursts, High Temperature Plasmas, Photons, Radiation Sources, Neutron Stars, Polarization (Charge Separation), Stellar Mass Accretion

Scientific paper

The pair e(+)-e(-) annihilation phenomena in hot plasma was studied in order to evaluate the photon energy spectrum. The spectra of the broadening 0.511 MeV annihilation line was calculated in the case of unthermalized plasma, i.e., Te(-) does not equal Te(+). The energy spectra from annihilation process for unthermalized positrons are characterized by the presence of flat part for energies greater than 0.511 MeV. The flattening in the spectrum of annihilation unthermalized plasma is a strong indication that the observed features of the hard tailed spectrum of the gamma bursts can be well described by annihilation of hot positrons and cold electrons. It is proposed that the mechanism for the production of unthermalized positrons is associated with the charge separation in Eddington limited accretion onto a neutron star.

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