Abstract
Phase-average spectrum and energy-dependent light curves of high-energy gamma-ray emission from the Crab pulsar have been detected recently by the Fermi Large Area Telescope (LAT). We use a modified three-dimensional outer gap model to study the features of the pulsed emission profile and spectra of the Crab pulsar from X-rays to Gamma-rays band. In this outer gap model, gamma-rays in the energy region greater than 100 MeV are produced through inverse Compton scattering from secondary pairs and the survival curvature photons. Our results show that the observed phase- averaged spectrum from X-rays to Gamma-rays including the Fermi LAT and MAGIC data can be reproduced well, and the basic properties of the observed energy-dependent light curves of both X-ray and Gamma-ray up to 25 GeV can be interpreted in this model.
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