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Title: Observation of Pulsed γ-Rays Above 25 GeV from the Crab Pulsar with MAGIC
Author: 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
Keywords: Púlsars
Telescopis espacials
Astronomia de raigs gamma
Radiació sincrotrònica
Space telescopes
Gamma ray astronomy
Synchrotron radiation
Issue Date: 2008
Publisher: American Association for the Advancement of Science
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.
Note: Versió postprint del document publicat a:
It is part of: Science, 2008, vol. 322, num. 5905, p. 1221-1224
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ISSN: 0036-8075
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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