Abstract
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 γ-ray photons by curvature radiation. These γ-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 γ-ray photons. We find that both the peak energy and the luminosity of γ-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.
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