Pulsar Outer-gap Electrodynamics: Hardening of Spectral Shape in the Trailing Peak in Gamma-ray Light Curve
arXiv:1104.5357 · doi:10.1088/2041-8205/733/2/L49
Abstract
The spectral characteristics of the pulsed gamma-ray emission from outer-magnetospheric particle accelerators are investigated. Either positrons or electrons are accelerated outwards by the magnetic-field-aligned electric field to emit gamma-rays via curvature process. Since the particles move along relatively straight paths in the trailing side of a rotating magnetosphere, they attain higher Lorentz factors to emit more energetic gamma-rays than those in the leading side. It is first demonstrated that the cutoff energy of the curvature radiation evolves with the rotation phase owing to the variation of the curvature radii of the particle paths and maximizes at a slightly later phase of the trailing peak in the gamma-ray light curve.
5 pages, 5 figures, ApJ Letters in press
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- Detection of bridge emission above 50 GeV from the Crab pulsar with the MAGIC telescopes
- Luminosity Evolution of Gamma-ray Pulsars
- An assessment of the pulsar outer gap model. I: Assumptions, uncertainties, and implications for the gap size and the accelerating field
- Does a strong particle accelerator arise very close to the light cylinder in a pulsar magnetosphere?