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Detection of Pulsed Gamma Rays Above 100 GeV from the Crab Pulsar

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arxiv 1108.3797 v1 pith:CBYFBEX7 submitted 2011-08-18 astro-ph.HE

VERITAS Collaboration: E. Aliu , T. Arlen , T. Aune , M. Beilicke , W. Benbow , A. Bouvier , S. M. Bradbury , J. H. Buckley
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V. Bugaev K. Byrum A. Cannon A. Cesarini J. L. Christiansen L. Ciupik E. Collins-Hughes M. P. Connolly W. Cui R. Dickherber C. Duke M. Errando A. Falcone J. P. Finley G. Finnegan L. Fortson A. Furniss N. Galante D. Gall K. Gibbs G. H. Gillanders S. Godambe S. Griffin J. Grube R. Guenette G. Gyuk D. Hanna J. Holder H. Huan G. Hughes C. M. Hui T. B. Humensky A. Imran P. Kaaret N. Karlsson M. Kertzman D. Kieda H. Krawczynski F. Krennrich M. J. Lang M. Lyutikov A. S Madhavan G. Maier P. Majumdar S. McArthur A. McCann M. McCutcheon P. Moriarty R. Mukherjee P. Nuñez R. A. Ong M. Orr A. N. Otte N. Park J. S. Perkins F. Pizlo M. Pohl H. Prokoph J. Quinn K. Ragan L. C. Reyes P. T. Reynolds E. Roache J. Rose J. Ruppel D. B. Saxon M. Schroedter G. H. Sembroski G. D. Şentürk A. W. Smith D. Staszak G. Tešić M. Theiling S. Thibadeau K. Tsurusaki J. Tyler A. Varlotta V. V. Vassiliev S. Vincent M. Vivier S. P. Wakely J. E. Ward T. C. Weekes A. Weinstein T. Weisgarber D. A. Williams B. Zitzer
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keywords gammaraysabovedetectionpulsarpulsedcrabexplained
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We report the detection of pulsed gamma rays from the Crab pulsar at energies above 100 Gigaelectronvolts (GeV) with the VERITAS array of atmospheric Cherenkov telescopes. The detection cannot be explained on the basis of current pulsar models. The photon spectrum of pulsed emission between 100 Megaelectronvolts (MeV) and 400 GeV is described by a broken power law that is statistically preferred over a power law with an exponential cutoff. It is unlikely that the observation can be explained by invoking curvature radiation as the origin of the observed gamma rays above 100 GeV. Our findings require that these gamma rays be produced more than 10 stellar radii from the neutron star.

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  1. Highlights of Galactic Physics with VERITAS

    astro-ph.HE 2019-08 unverdicted novelty 1.0 of 10

    A proceedings summary of already-published VERITAS Galactic very high-energy gamma-ray results, containing no new measurements or claims.

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