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Title:
Cascade model of gamma-ray bursts
Authors:
Sturrock, P. A.; Harding, A. K.; Daugherty, J. K.
Affiliation:
AA(Stanford University, CA), AB(NASA, Goddard Space Flight Center, Greenbelt, MD), AC(North Carolina, University, Asheville)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 346, Nov. 15, 1989, p. 950-959. Research supported by the Research Corp. Previously announced in STAR as N88-27998. (ApJ Homepage)
Publication Date:
11/1989
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Energy Spectra, Gamma Ray Bursts, Mathematical Models, Pair Production, Positron Annihilation, Pulsars, Cascade Flow, Computerized Simulation, Electron-Positron Pairs, Particle Acceleration, Stellar Spectra
DOI:
10.1086/168075
Bibliographic Code:
1989ApJ...346..950S

Abstract

If, in a neutron star magnetosphere, an electron is accelerated to an energy of 10 to the 11th or 12th power eV by an electric field parallel to the magnetic field, motion of the electron along the curved field line leads to a cascade of gamma rays and electron-positron pairs. This process is believed to occur in radio pulsars and gamma ray burst sources. Results are presented from numerical simulations of the radiation and photon annihilation pair production processes, using a computer code previously developed for the study of radio pulsars. A range of values of initial energy of a primary electron was considered along with initial injection position, and magnetic dipole moment of the neutron star. The resulting spectra was found to exhibit complex forms that are typically power law over a substantial range of photon energy, and typically include a dip in the spectrum near the electron gyro-frequency at the injection point. The results of a number of models are compared with data for the 5 Mar., 1979 gamma ray burst. A good fit was found to the gamma ray part of the spectrum, including the equivalent width of the annihilation line.

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