Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...340..443r&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 340, May 1, 1989, p. 443-454. Research supported by Ball Corp., Rockwell In
Astronomy and Astrophysics
Astrophysics
7
Gamma Ray Absorption, Magnetic Dipoles, Neutron Stars, Pair Production, Pulsar Magnetospheres, Compton Effect, Magnetic Fields, Monte Carlo Method, Radiative Transfer, Schwarzschild Metric
Scientific paper
Calculations are made of the propagation of gamma-rays around neutron stars with a dipole magnetic field, including the effects of general relativity and the absorption by the one-photon magnetic pair production process, as a model for the high-energy transport in gamma-ray burst sources and pulsars. The paper discusses the escaping photon beam characteristics as seen by distant observers at different angles with respect to the magnetic axis, for radiation arising from the polar caps of neutron stars of varying degrees of compactness and surface field strengths. The observed beaming depends strongly on the surface field only up to B of about 0.05 times the critical field value, being essentially constant above the value 0.1. The gravitational light bending contributes significantly to broaden the beam profiles especially at low energies above threshold, being sensitive to the stellar radius to mass ratio.
Bagoly Zs.
Meszaros Peter
Riffert Harald
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