Wednesday, February 15, 2012

1202.3008 (S. Klepser et al.)

Phase-resolved Crab pulsar measurements from 25 to 400 GeV with the MAGIC telescopes    [PDF]

S. Klepser, G. Giavitto, M. López, T. Y. Saito, T. Schweizer, I. Snidaric, R. Zanin, for the MAGIC collaboration
We report on observations of the Crab pulsar with the MAGIC telescopes. Our data were taken in both monoscopic (> 25GeV) and stereoscopic (> 50GeV) observation modes. Two peaks were detected with both modes and phase-resolved energy spectra were calculated. By comparing with Fermi- LAT measurements, we find that the energy spectrum of the Crab pulsar does not follow a power law with an exponential cutoff, but has an additional hard component, extending up to at least 400 GeV. This suggests that the emission above 25 GeV is not dominated by curvature radiation, as suggested in the standard scenarios of the OG and SG models.
View original: http://arxiv.org/abs/1202.3008

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