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Abstract: A young and energetic pulsar powers the well-known Crab Nebula. Here wedescribe two separate gamma-ray photon energy >100 MeV flares from thissource detected by the Large Area Telescope on board the Fermi Gamma-ray SpaceTelescope. The first flare occurred in February 2009 and lasted approximately16 days. The second flare was detected in September 2010 and lastedapproximately 4 days. During these outbursts the gamma-ray flux from the nebulaincreased by factors of four and six, respectively. The brevity of the flaresimplies that the gamma rays were emitted via synchrotron radiation from PeV10^15 eV electrons in a region smaller than 1.4 10^-2 pc. These are thehighest energy particles that can be associated with a discrete astronomicalsource, and they pose challenges to particle acceleration theory.



Author: Fermi-LAT Collaboration

Source: https://arxiv.org/







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