Bibcode
Aleksić, J.; Alvarez, E. A.; Antonelli, L. A.; Antoranz, P.; Asensio, M.; Backes, M.; Barrio, J. A.; Bastieri, D.; Becerra-González, J.; Bednarek, W.; Berdyugin, A.; Berger, K.; Bernardini, E.; Biland, A.; Blanch, O.; Bock, R. K.; Boller, A.; Bonnoli, G.; Borla Tridon, D.; Braun, I.; Bretz, T.; Cañellas, A.; Carmona, E.; Carosi, A.; Colin, P.; Colombo, E.; Contreras, J. L.; Cortina, J.; Cossio, L.; Covino, S.; Dazzi, F.; De Angelis, A.; De Caneva, G.; De Cea del Pozo, E.; De Lotto, B.; Delgado-Méndez, C.; Diago-Ortega, A.; Doert, M.; Domínguez, A.; Dominis Prester, D.; Dorner, D.; Doro, M.; Eisenacher, D.; Elsaesser, D.; Ferenc, D.; Fonseca, M. V.; Font, L.; Fruck, C.; García-López, R. J.; Garczarczyk, M.; Garrido, D.; Giavitto, G.; Godinović, N.; Hadasch, D.; Häfner, D.; Herrero, A.; Hildebrand, D.; Höhne-Mönch, D.; Hose, J.; Hrupec, D.; Jogler, T.; Kellermann, H.; Klepser, S.; Krähenbühl, T.; Krause, J.; Kushida, J.; La Barbera, A.; Lelas, D.; Leonardo, E.; Lindfors, E.; Lombardi, S.; López, M.; López-Oramas, A.; Lorenz, E.; Makariev, M.; Maneva, G.; Mankuzhiyil, N.; Mannheim, K.; Maraschi, L.; Marcote, B.; Mariotti, M.; Martínez, M.; Mazin, D.; Meucci, M.; Miranda, J. M.; Mirzoyan, R.; Moldón, J.; Moralejo, A.; Munar-Adrover, P.; Nieto, D.; Nilsson, K.; Orito, R.; Otte, N.; Oya, I.; Paneque, D.; Paoletti, R.; Pardo, S.; Paredes, J. M.; Partini, S.; Perez-Torres, M. A. et al.
Referencia bibliográfica
The Astrophysical Journal, Volume 742, Issue 1, article id. 43 (2011).
Fecha de publicación:
11
2011
Revista
Número de citas
79
Número de citas referidas
58
Descripción
We report on the observation of γ-rays above 25 GeV from the Crab
pulsar (PSR B0532+21) using the MAGIC I telescope. Two data sets from
observations during the winter period 2007/2008 and 2008/2009 are used.
In order to discuss the spectral shape from 100 MeV to 100 GeV, one year
of public Fermi Large Area Telescope (Fermi-LAT) data are also analyzed
to complement the MAGIC data. The extrapolation of the exponential
cutoff spectrum determined with the Fermi-LAT data is inconsistent with
MAGIC measurements, which requires a modification of the standard pulsar
emission models. In the energy region between 25 and 100 GeV, the
emission in the P1 phase (from -0.06 to 0.04, location of the main
pulse) and the P2 phase (from 0.32 to 0.43, location of the interpulse)
can be described by power laws with spectral indices of -3.1
± 1.0stat ± 0.3syst and -3.5
± 0.5stat ± 0.3syst, respectively.
Assuming an asymmetric Lorentzian for the pulse shape, the peak
positions of the main pulse and the interpulse are estimated to be at
phases -0.009 ± 0.007 and 0.393 ± 0.009, while the
full widths at half-maximum are 0.025 ± 0.008 and 0.053 ±
0.015, respectively.