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Title:
A curvature-radiation-pair-production model for gamma-ray pulsars
Authors:
Harding, A. K.; Tademaru, E.; Esposito, L. W.
Affiliation:
AA(Massachusetts, University, Amherst, Mass.), AB(Massachusetts, University, Amherst, Mass.), AC(Massachusetts, University, Amherst, Mass.)
Publication:
Astrophysical Journal, Part 1, vol. 225, Oct. 1, 1978, p. 226-236. (ApJ Homepage)
Publication Date:
10/1978
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Gamma Rays, Pair Production, Pulsars, Stellar Models, Approximation, Magnetospheres, Neutron Stars, Optical Thickness, Positrons, Pulse Amplitude, Pulse Duration, Pulsed Radiation, Radiation Spectra, Ray Tracing, Stellar Magnetic Fields, Stellar Rotation
DOI:
10.1086/156486
Bibliographic Code:
1978ApJ...225..226H

Abstract

On the assumptions that pulsar gamma-rays are produced via curvature radiation of primary electrons near the neutron star and are attenuated only through the pair-production process in strong electric and magnetic fields, a detailed model of the magnetosphere is used to calculate the resulting optical depths and pulse shapes. The effect of both zero and nonzero Ex B on the attenuation of the photons is considered along with the effect of photon energy, rotation rate, and obliquity on the pulse shapes. It is found that pulsar rotation tends to increase pair production, causing large optical depths for the shortest-period pulsars. The calculations also predict high-energy cutoffs and spectra for the observable gamma-ray emission.

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