Variable high-energy γ-ray emission from pulsar wind nebulae

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Pulsars, Gamma-Ray Sources, Gamma-Ray Bursts, X-Ray, X-Ray Sources, X-Ray Bursts

Scientific paper

There is growing evidence that some pulsar wind nebulae (PWN) are significant sources of variable emission above 100 MeV. We review the observational evidence associating five PWN and candidate PWN with the four sources showing the most >100 MeV variability among Galactic sources that are bright above 1 GeV. We discuss potential physical mechanisms for such variability, examine the apparent X-ray and radio efficiencies, and place limits on the magnetic field required for variable synchrotron emission at such high energies. .

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