Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978a%26a....67...55s&link_type=abstract
Astronomy and Astrophysics, vol. 67, no. 1, June 1978, p. 55-63.
Astronomy and Astrophysics
Astronomy
32
Gamma Ray Astronomy, Pair Production, Pulsars, Stellar Radiation, Luminous Intensity, Neutron Stars, Radiation Distribution, Rosette Shapes, Stellar Magnetic Fields
Scientific paper
Pulsed gamma-ray emission from pulsars is analyzed using the model of a magnetized neutron star rotating at some angular frequency about an axis that is perpendicular to both the magnetic axis and the line of sight. It is assumed that the primary particles accelerated at the stellar surface glide along open field lines and emit curvature radiation, which can be absorbed by pair production of secondary particles. The transfer problem considered includes the dipolar geometry of the magnetic field, rotation of the entire pattern, and such ensuing effects as induction, aberration, and Doppler shift. Geometrical and dynamical features of the model are examined, the emission part of the transfer problem is solved analytically, and the contribution of secondary particles is taken into account in an 'on-the-spot' approximation. Numerical calculations are performed for the case of PSR 0833-45 in the framework of a slightly modified version of the pulsar theory developed by Ruderman and Sutherland (1975). The results obtained indicate that a purely dipolar stellar field and a monochromatic primary spectrum lead to flux densities which are in good agreement with the observations of PSR 0833-45 upon application of a normalization factor.
Massaro Enrico
Salvati Marco
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