Physics
Scientific paper
Jul 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983aipc..101...65k&link_type=abstract
AIP Conference Proceedings, Volume 101, pp. 65-75 (1983).
Physics
6
X-Ray Sources, X-Ray Bursts, Radiation Mechanisms, Polarization, Neutron Stars
Scientific paper
Gamma ray bursts have remained an enigma for a decade. This is attributable to the difficulty of obtaining accurate positions, the low duty cycle of burst sources which prevents planned observation, and their low mean power which rules out arguments based on gross energetics. Several lines of evidence now point to an origin in neutron star magnetospheres, confirming early speculations largely based on the availability of high energy density. The evidence includes spectral features interpreted as cyclotron and gravitationally redshifted annihilation lines, and temporal periodicity interpreted as rotation. The reason for the outbursts remains as much as a mystery as when they were first discovered. It is unclear whether gamma ray bursters are located in binary stars, or whether this is incidental or essential to their activity. It is not known if there is any evoltionary connection or physical resemblance between gamma ray bursters and pulsars or accretional x-ray sources. I discuss some of the problems which arise in constructing models for gamma ray bursters, with particular attention to the event of March 5, 1979, physical processes at high energy density, and the role of electron-positron pairs in producing line and continuum radiation.
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