Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983aipc..101...94c&link_type=abstract
IN: Positron-electron pairs in astrophysics; Proceedings of the Workshop, Greenbelt, MD, January 6-8, 1983 (A85-31276 13-90). Ne
Astronomy and Astrophysics
Astrophysics
1
Gamma Ray Bursts, Pair Production, Positrons, Stellar Radiation, Neutron Stars, Photons, Stellar Mass Accretion
Scientific paper
The emission mechanism of the hard photon spectrum of gamma-ray bursts is investigated theoretically. It is proposed that repetitive ms-time-scale infalls of matter layers onto the surface of the neutron star during Eddington-limited accretion yield sufficient gravitational energy to raise the available energy per electron from 300 keV to 100 MeV, if 10 to the 24th electrons/sq cm or more are allowed by the radiating mechanism. The resulting photon flux pushes the electrons away from the star and produces a charge separation of 100-1000 V/cm, and this field plus the radiation stress accelerates the positrons produced by the high-energy photon spectrum in pair production. It is calculated that a positron flux giving annihilation radiation comparable to that of the high state of the Galactic center would result from infall of Fe if the rate of gamma bursts corresponds to an average flux of 0.00014 photons/sq cm s.
Colgate Sterling A.
Petschek Albert G.
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