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Aliu, E; Anderhub, H; Antonelli, L A; Baixeras, C; Barrio, J A; Bartko, H; Bastieri, D; Berger, K; Bernardini, E; Biland, A; Bock, R K; Bordas, P; Bretz, T; Camara, M; Carmona, E; Chilingarian, A; Commichau, S; Covino, S; Dazzi, F; De Angelis, A; De Cea Del Pozo, E; de Los Reyes, R; De Maria, M; De Sabata, F; Dominguez, A; Dorner, D; Elsässer, D; Errando, M; Fagiolini, M; Ferenc, D; Firpo, R; Fonseca, M V; Font, L; Galante, N; Garcia Lopez, R J; Garczarczyk, M; Goebel, F; Hadasch, D; Hayashida, M; Herrero, A; Höhne, D; Hose, J; Hsu, C C; Jogler, T; Kranich, D; La Barbera, A; Leonardo, E; Lindfors, E; Lombardi, S; Longo, F; Majumdar, P; Mankuzhiyil, N; Maraschi, L; Mariotti, M; Martinez, M; Mazin, D; Mirzoyan, R; Moles, M; Ninkovic, J; Otte, N; Oya, I; Paoletti, R; Pascoli, D; Pauss, F; Peruzzo, L; Piccioli, A; Prada, F; Prandini, E; Puchades, N; Raymers, A; Rhode, W; Ribó, M; Rico, J; Rissi, M; Saggion, A; Saito, T Y; Salvati, M; Sartori, P; Satalecka, K; Scalzotto, V; Shayduk, M; Shinozaki, K; Shore, S N; Sillanpää, A; Sobczynska, D; Spanier, F; Stamerra, A; Stark, L S; Takalo, L; Temnikov, P; Tescaro, D; Teshima, M; Tluczykont, M; Vankov, H; Vitale, V; Wittek, W; Zandanel, F; Zapatero, J; de Jager, O C; de Ona Wilhelmi, E
Science (American Association for the Advancement of Science), 11/2008, Volume: 322, Issue: 5905Journal Article
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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