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The spectral characteristics of the pulsed gamma-ray emission fromouter-magnetospheric particle accelerators are investigated. Either positronsor electrons are accelerated outwards by the magnetic-field-aligned electricfield to emit gamma-rays via curvature process. Since the particles move alongrelatively straight paths in the trailing side of a rotating magnetosphere,they attain higher Lorentz factors to emit more energetic gamma-rays than thosein the leading side. It is first demonstrated that the cutoff energy of thecurvature radiation evolves with the rotation phase owing to the variation ofthe curvature radii of the particle paths and maximizes at a slightly laterphase of the trailing peak in the gamma-ray light curve.

Pulsar Outer-gap Electrodynamics: Hardening of Spectral Shape in the Trailing Peak in Gamma-ray Light Curve