On the very high energy (>25GeV) pulsed emission in the Crab pulsar

Details On the very high energy (>25GeV) pulsed emission in the Crab pulsar On the very high energy (>25GeV) pulsed emission in the Crab pulsar

2009-07-08

arxiv.org/abs/0907.1385v3

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

11 pages, 1 figure

Scientific paper

We have examined the recently detected very high energy (VHE) pulsed radiation from the Crab pulsar. According to the observational evidence, the observed emission (>25GeV) peaks at the same phase with the optical spectrum. Considering the cyclotron instability, we show that the pitch angle becomes non-vanishing leading to the efficient synchrotron mechanism near the light cylinder surface. The corresponding spectral index of the emission equals -1/2. By studying the inverse Compton scattering and the curvature radiation, it is argued that the aforementioned mechanisms do not contribute to the VHE radiation detected by MAGIC.

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