Vhe Γ-ray Observation of the Crab Nebula and Its Pulsar with the Magic Telescope
نویسندگان
چکیده
We report about very high energy (VHE) γ-ray observations of the Crab Nebula with the MAGIC telescope. The γ-ray flux from the nebula was measured between 60GeV and 9TeV. The energy spectrum can be described with a curved power law dF dE = f0 (E/300GeV) (a+b log10(E/300GeV)) with a flux normalization f0 of (6.0 ± 0.2stat) × 10 cmsTeV, a = −2.31 ± 0.06stat and b = −0.26± 0.07stat. The position of the IC-peak is determined at (77± 47)GeV. Within the observation time and the experimental resolution of the telescope, the γ-ray emission is steady and pointlike. The emission’s center of gravity coincides with the position of the pulsar. Pulsed γ-ray emission from the pulsar could not be detected. We constrain the cutoff energy of the spectrum to be less than 27GeV, assuming that the differential energy spectrum has an exponential cutoff. For a super-exponential shape, the cutoff energy can be as high as 60GeV. Subject headings: pulsars: individual (PSR B0531+21) — acceleration of particles — radiation mechanisms: non-thermal — gamma rays: observations a Universität Würzburg, D-97074 Würzburg, Germany b Institut de F́ısica d’Altes Energies, Edifici Cn., E-08193 Bellaterra (Barcelona), Spain c ETH Zurich, CH-8093 Switzerland d Universidad Complutense, E-28040 Madrid, Spain e Universitat Autònoma de Barcelona, E-08193 Bellaterra, Spain f Max-Planck-Institut für Physik, D-80805 München, Germany g Università di Padova and INFN, I-35131 Padova, Italy h Universität Dortmund, D-44227 Dortmund, Germany i University of Lódź, PL-90236 Lodz, Poland j Universitat de Barcelona, E-08028 Barcelona, Spain k Yerevan Physics Institute, AM-375036 Yerevan, Armenia l Tuorla Observatory, Turku University, FI-21500 Piikkiö, Finland m Instituto de Astrofisica de Canarias, E-38200, La Laguna, Tenerife, Spain n Università di Udine, and INFN Trieste, I-33100 Udine, Italy o Università di Siena, and INFN Pisa, I-53100 Siena, Italy p University of California, Davis, CA-95616-8677, USA q Humboldt-Universität zu Berlin, D-12489 Berlin, Germany r Institute for Nuclear Research and Nuclear Energy, BG-1784 Sofia, Bulgaria s INAF/Osservatorio Astronomico and INFN Trieste, I-34131 Trieste, Italy t Università di Pisa, and INFN Pisa, I-56126 Pisa, Italy u ICREA and Institut de Cienciès de l’Espai, IEEC-CSIC, E08193 Bellaterra, Spain * Corresponding author, [email protected]
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تاریخ انتشار 2009