Mathematics – Probability
Scientific paper
Oct 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...223l...9m&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 223, no. 1-2, Oct. 1989, p. L9-L12. Research supported by the Alfred P. Sloan
Mathematics
Probability
1
Absorption Spectra, Astronomical Spectroscopy, Gamma Ray Bursts, Gamma Ray Spectra, Neutron Stars, Compton Effect, Cyclotron Radiation, Monte Carlo Method, Photosphere, Probability Theory, Stellar Magnetospheres
Scientific paper
It has recently been suggested that several mechanisms for the primary release of energy in gamma-ray bursts may result in the excitation of magnetospheric plasma oscillations (MPO) above the polar cap of a neutron star. The basic MPO idea is refined by determining the soft photon source (which damps the particle motion via inverse Compton scattering interactions) self-consistently by means of a Monte Carlo simulation for the deposition of back-scattered gamma-ray energy below the stellar photosphere. The observed fraction of bursts displaying low-energy absorption features may be understood in the context of a model wherein the overall spectrum changes with inclination angle due to the superposition of several components with different angular distributions. GRB spectra should display these cyclotron lines about 18 percent of the time, which is consistent with the KONUS and Ginga sets of data.
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