Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999pasj...51..683h&link_type=abstract
Publications of the Astronomical Society of Japan, v.51, p.683.
Astronomy and Astrophysics
Astronomy
20
Gamma-Rays: Theory, Magnetic Field, Pulsars: General
Scientific paper
We consider the structure of a stationary outer-gap accelerator around an oblique rotator. Pulsar wind may bring about charge depletion in the magnetosphere near to the light cylinder; the charge depletion, in turn, would cause a large electric field along the magnetic field lines. Positrons or electrons migrating in the gap are accelerated by this field to radiate gamma -ray photons by curvature radiation. These gamma -ray photons produce yet more radiating particles by colliding with surface blackbody X-ray photons, leading to a pair-production cascade in the gap. The replenished charges partially screen the longitudinal electric field, which is self-consistently solved together with the distribution of e+/-'s and gamma -ray photons. We find that both the peak energy and the luminosity of gamma -rays are a decreasing function of the surface blackbody temperature. Applying the results to PSR B1706-44, we can predict that its unobserved X-ray spectrum has a blackbody temperature of about 100 eV.
Hirotani Kouichi
Shibata Shinpei
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