Gamma-ray emission from Outer-Gap of pulsar magnetosphere

We develop a model for gamma-ray emission from the outer magnetosphere of pulsars (the outer-gap model). The charge depletion causes a large electric field which accelerates electrons and positrons. We solve the electric field with radiation and pair creation processes self-consistently, and calcula...

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Bibliographic Details
Published inarXiv.org
Main Authors Takata, Junpei, Shibata, Sinpei, Hirotani, Kouichi
Format Paper
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 03.12.2002
Subjects
Curvature
Depletion
Electric fields
Emission
Fluxes
Gamma rays
Positrons
Pulsar magnetospheres
Pulsars
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Summary:We develop a model for gamma-ray emission from the outer magnetosphere of pulsars (the outer-gap model). The charge depletion causes a large electric field which accelerates electrons and positrons. We solve the electric field with radiation and pair creation processes self-consistently, and calculate curvature spectrum and Inverse-Compton (IC) spectrum. We apply this theory to PSR B0833-45 (Vela) and B1706-44 for which their surface magnetic fields, observed thermal X-rays are similar to each other. We find that each observed cut-off energies of the gamma-rays are well explained. By inclusion of emission outside the gap, the spectrum is in better agreement with the observations than the spectrum arising only from the inside of the gap. The expected TeV fluxes are much smaller than that observed by CANGAROO group in the direction of B1706-44.
ISSN:2331-8422