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Observation of Pulsed Gamma-rays Above 25 GeV from the Crab Pulsar with MAGIC

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arxiv 0809.2998 v2 pith:DL7BSCZC submitted 2008-09-17 astro-ph

classification astro-ph
keywords pulsarpulsedcrabcutoffemissionenergygamma-rayshigh
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One fundamental question about pulsars concerns the mechanism of their pulsed electromagnetic emission. Measuring the high-end region of a pulsar's spectrum would shed light on this question. By developing a new electronic trigger, we lowered the threshold of the Major Atmospheric gamma-ray Imaging Cherenkov (MAGIC) telescope to 25 GeV. In this configuration, we detected pulsed gamma-rays from the Crab pulsar that were greater than 25 GeV, revealing a relatively high cutoff energy in the phase-averaged spectrum. This indicates that the emission occurs far out in the magnetosphere, hence excluding the polar-cap scenario as a possible explanation of our measurement. The high cutoff energy also challenges the slot-gap scenario.

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Cited by 1 Pith paper

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  1. Highlights of Galactic Physics with VERITAS

    astro-ph.HE 2019-08 unverdicted novelty 1.0 of 10

    A proceedings summary of already-published VERITAS Galactic very high-energy gamma-ray results, containing no new measurements or claims.

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