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

  • We report the detection of pulsed gamma rays from the Crab pulsar at energies above 100 giga-electron volts (GeV) with the Very Energetic Radiation Imaging Telescope Array System (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 mega-electron volts 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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Author details:E. Aliu, T. Arlen, T. Aune, M. Beilicke, W. Benbow, A. Bouvier, S. M. Bradbury, J. H. Buckley, 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. Nunez, R. A. Ong, M. Orr, A. N. Otte, N. Park, J. S. Perkins, F. Pizlo, Martin PohlORCiDGND, H. Prokoph, J. Quinn, K. Ragan, L. C. Reyes, P. T. Reynolds, E. Roache, H. J. Rose, J. Ruppel, D. B. Saxon, M. Schroedter, G. H. Sembroski, G. D. Sentuerk, A. W. Smith, D. Staszak, G. Tesic, 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
DOI:https://doi.org/10.1126/science.1208192
ISSN:0036-8075
Title of parent work (English):Science
Publisher:American Assoc. for the Advancement of Science
Place of publishing:Washington
Publication type:Article
Language:English
Year of first publication:2011
Publication year:2011
Creating corporation:VERITAS Collaboration
Release date:2017/03/26
Volume:334
Issue:6052
Number of pages:4
First page:69
Last Page:72
Funding institution:U.S. Department of Energy; NSF; Smithsonian Institution; Natural Sciences and Engineering Research Council of Canada; Science Foundation Ireland (SFI) [10/RFP/AST2748]; Science and Technology Facilities Council in the United Kingdom; Alexander von Humboldt Foundation
Organizational units:Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie
Peer review:Referiert
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