Pulsed<i>e</i>⁺Annihilation γ‐Ray Line from a Crab‐like Pulsar

Electron-positron pair production and annihilation within the magnetosphere of a c-ray pulsar such as the Crab are considered. Outer-magnetosphere accelerator models seem capable of giving both the 1040 s~1 eB pair annihilation rate and the narrow, gravitationally redshifted eB annihilation line shape in the Crab pulsar spectrum reported by the FIGARO collaboration. An essential feature is the expected formation of an electron-positron layer well above the pulsar surface, in which gravitational pull toward the star is balanced by cyclotron resonance scattering of polar cap X-rays. Applications to other c-ray pulsars with smaller spin-down powers than that of the Crab pulsar are also considered.

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