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Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/44966
Observation of Pulsed γ-Rays Above 25 GeV from the Crab Pulsar with MAGIC
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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 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.
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ALIU, E., BARRIO, J. a., BORDAS COMA, Pol, BOSCH I RAMON, Valentí, CAMARA, M., CONTRERAS, J. l., CORTINA BLANCO, Juan, REYES, R. de los, ERRANDO, M., MIRANDA, J. m., MORALEJO, Abelardo, NIETO, D., OYA, I., PAREDES I POY, Josep maria, PUCHADES, N., RIBÓ GOMIS, Marc, SIDRO MARTÍN, Núria, TESCARO, Diego, ZABALZA DE TORRES, Víctor, ZANIN, Roberta. Observation of Pulsed γ-Rays Above 25 GeV from the Crab Pulsar with MAGIC. _Science_. 2008. Vol. 322, núm. 5905, pàgs. 1221-1224. [consulta: 14 de gener de 2026]. ISSN: 0036-8075. [Disponible a: https://hdl.handle.net/2445/44966]