Energy-dependent Light Curves and Phase-resolved Spectra of High-energy Gamma-rays from the Crab Pulsar

Details Energy-dependent Light Curves and Phase-resolved Spectra of High-energy Gamma-rays from the Crab Pulsar Energy-dependent Light Curves and Phase-resolved Spectra of High-energy Gamma-rays from the Crab Pulsar

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010apj...725.2225l&link_type=abstract

The Astrophysical Journal, Volume 725, Issue 2, pp. 2225-2231 (2010).

Astronomy and Astrophysics

Astronomy

2

Gamma Rays: General, Pulsars: Individual: Crab, Stars: Neutron

Scientific paper

Energy-dependent light curves and phase-resolved spectra of high-energy γ-ray emission from the Crab pulsar have been detected recently by the Fermi Large Area Telescope (LAT). Within the framework of a two-pole, three-dimensional outer gap model, we calculate the energy-dependent light curves and phase-resolved spectra in the inertial observer's frame. Our results show that (1) the observed γ-ray properties from both Fermi LAT and MAGIC can be reproduced well in this model; (2) the first peak of the light curves in the energy region less than ~10 GeV comes from the sum of emissions from both the north and south poles, and the second peak comes only from the emission from the south pole; however, the relative contribution of the two poles to the first peak changes with increasing γ-ray energy, and the light curve in the energy region greater than ~20 GeV comes completely from the emission of the south pole; and (3) γ-rays in the energy region greater than 100 MeV are produced through inverse Compton scattering from secondary pairs and the survival curvature photons, where the latter dominate over γ-ray emission in the energy region greater than several GeV.

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