Fermi Large Area Telescope Observations of Pulsar Wind Nebulae
Fermi Large Area Telescope Observations of Pulsar Wind Nebulae
Fermi Large Area Telescope Observations of Pulsar Wind Nebulae
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LAT <strong>Observations</strong> <strong>of</strong> the Crab <strong>Pulsar</strong> and Nebula(Abdo et al., 2010, ApJ, 708, 1254)• Spectral analysis <strong>of</strong> the pulsar :• Performed on the whole pulse phase interval• Best fit above 100 MeV obtained with a power-law with an exponentialcut-<strong>of</strong>f :• Spectral Index = (1.97 ± 0.02 ± 0.06)• Cut-<strong>of</strong>f energy = (5.8 ± 0.5 ± 1.2) GeV• Flux above 100 MeV = (2.09 ± 0.03 ± 0.18)x10 -6 cm -2 s -1• Pulsed photons observed up to ~20 GeV : consistent with an emittingregion well above the NS surfaceSpectral energy distribution<strong>of</strong> the Crab <strong>Pulsar</strong>See also R. Shannon and V.Kondratiev's talk on tuesdayM.-H. Grondin, High-Energy Emission from <strong>Pulsar</strong>s and their Systems, April 2010 11
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