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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The region <strong>of</strong> Westerlund 2• An extended TeV source, HESS J1023-575, was detected (Aharonian, F., et al.2007, A&A, 467, 1075) in the region <strong>of</strong> Westerlund 2• Several scenarii to explain this VHE emission :• massive WR binary system WR 20a• young stellar cluster Westerlund 2• cosmic rays accelerated at theirtermination shock and interactingwith their environmentWesterlund 2• The HESS emission slightly <strong>of</strong>fset fromWR 20a and Westerlund 2• The HESS emission is extended→ disfavors the binary system andstellar cluster hypothesesWR 20aHESScontours843 MHz image <strong>of</strong> the region <strong>of</strong> Westerlund 2(Aharonian, F., et al. 2007, A&A, 467, 1075)M.-H. Grondin, High-Energy Emission from <strong>Pulsar</strong>s and their Systems, April 2010 21
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