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http://hdl.handle.net/2445/44966
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 Electromagnetisme Astronomia de raigs gamma Magnetosfera Radiació sincrotrònica Pulsars Space telescopes Electromagnetism Gamma ray astronomy Magnetosphere 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: http://dx.doi.org/10.1126/science.1164718 |
It is part of: | Science, 2008, vol. 322, num. 5905, p. 1221-1224 |
URI: | http://hdl.handle.net/2445/44966 |
Related resource: | http://dx.doi.org/10.1126/science.1164718 |
ISSN: | 0036-8075 |
Appears in Collections: | Articles publicats en revistes (Física Quàntica i Astrofísica) |
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