Spectra of gamma-ray bursts

Details Spectra of gamma-ray bursts Spectra of gamma-ray bursts

Jun 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...293...56h&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 293, June 1, 1985, p. 56-68.

Astronomy and Astrophysics

Astrophysics

23

Gamma Ray Bursts, Gamma Ray Spectra, Photon-Electron Interaction, Compton Effect, Electron Acceleration, Monte Carlo Method, Photosphere, Synchrotron Radiation

Scientific paper

It is shown that gamma-ray burst spectra are basically thermal synchrotron spectra emitted in a cold 'photosphere' by electrons excited to high Landau levels by high-energy photons that are beamed along the magnetic field lines. The high-energy radiation is produced in a corona by the interaction of soft, thermal photons and synchrotron photons with one-dimensional, relativistic electrons in a strong magnetic field. These coronal electrons are accelerated by short-scale magnetic reconnection. The physical parameters of the coronal layer are self-consistently determined. Monte Carlo simulations that include Compton and resonant scattering produce spectra in good agreement with the observations between 20 keV and 1 MeV. It is speculated that the recently discovered high-energy tail of the spectrum is formed in the outer corona and the wind zone. It is also shown that the emission is strongly anisotropic, and consequently, the most intense bursts need not be the closest.

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