Observation of Pulsed γ-Rays Above 25 GeV from the Crab Pulsar with MAGIC

Crab Pulsar Cut-off
DOI: 10.1126/science.1164718 Publication Date: 2008-10-17T01:11:20Z
AUTHORS (148)
ABSTRACT
One fundamental question about pulsars concerns the mechanism of their pulsed electromagnetic emission. Measuring high-end region a pulsar's spectrum would shed light on this question. By developing new electronic trigger, we lowered threshold Major Atmospheric gamma-ray Imaging Cherenkov (MAGIC) telescope to 25 GeV. In configuration, detected gamma-rays from Crab pulsar that were greater than GeV, revealing relatively high cutoff energy in phase-averaged spectrum. This indicates emission occurs far out magnetosphere, hence excluding polar-cap scenario as possible explanation our measurement. The also challenges slot-gap scenario.
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