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2008

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Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/44966

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

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http://dx.doi.org/10.1126/science.1164718

Abstract

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 γ-ray Imaging Cherenkov (MAGIC) telescope to 25 giga-electron volts. In this configuration, we detected pulsed γ-rays from the Crab pulsar that were greater than 25 giga-electron volts, 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.

Subject

Púlsars, Telescopis espacials, Electromagnetisme, Astronomia de raigs gamma, Magnetosfera, Radiació sincrotrònica

Subject (English)

Pulsars, Space telescopes, Electromagnetism, Gamma ray astronomy, Magnetosphere, Synchrotron radiation

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Articles publicats en revistes (Física Quàntica i Astrofísica)

Citation

ALIU, E., et al. Observation of Pulsed γ-Rays Above 25 GeV from the Crab Pulsar with MAGIC. Science. 2008. Vol. 322, num. 5905, pags. 1221-1224. ISSN 0036-8075. [consulted: 14 of June of 2026]. Available at: https://hdl.handle.net/2445/44966

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