The American Astronomical Society (AAS), established in 1899 and based in Washington, DC, is the major organization of professional astronomers in North America. Its membership of about 7,000 individuals also includes physicists, mathematicians, geologists, engineers, and others whose research and educational interests lie within the broad spectrum of subjects comprising contemporary astronomy. The mission of the AAS is to enhance and share humanity's scientific understanding of the universe.
The Institute of Physics (IOP) is a leading scientific society promoting physics and bringing physicists together for the benefit of all. It has a worldwide membership of around 50 000 comprising physicists from all sectors, as well as those with an interest in physics. It works to advance physics research, application and education; and engages with policy makers and the public to develop awareness and understanding of physics. Its publishing company, IOP Publishing, is a world leader in professional scientific communications.
VHE γ-Ray Observation of the Crab Nebula and its Pulsar with the MAGIC Telescope
J. Albert1, E. Aliu2, H. Anderhub3, P. Antoranz4, A. Armada2, C. Baixeras5, J. A. Barrio4, H. Bartko6, D. Bastieri7, J. K. Becker8, W. Bednarek9, K. Berger1, C. Bigongiari7, A. Biland3, R. K. Bock6,7, P. Bordas10, V. Bosch-Ramon10, T. Bretz1, I. Britvitch3, M. Camara4, E. Carmona6, A. Chilingarian11, J. A. Coarasa6, S. Commichau3, J. L. Contreras4, J. Cortina2, M. T. Costado12, V. Curtef8, V. Danielyan11, F. Dazzi7, A. De Angelis13, C. Delgado12, R. de los Reyes4, B. De Lotto13, E. Domingo-Santamaría2, D. Dorner1, M. Doro7, M. Errando2, M. Fagiolini14, D. Ferenc15, E. Fernández2, R. Firpo2, J. Flix2, M. V. Fonseca4, L. Font5, M. Fuchs6, N. Galante6, R. García-López12, M. Garczarczyk6, M. Gaug7, M. Giller9, F. Goebel6, D. Hakobyan11, M. Hayashida6, T. Hengstebeck16, A. Herrero12, D. Höhne1, J. Hose6, C. C. Hsu6, P. Jacon9, T. Jogler6, R. Kosyra6, D. Kranich3, R. Kritzer1, A. Laille15, E. Lindfors17, S. Lombardi7, F. Longo13, J. López2, M. López4, E. Lorenz3,6, P. Majumdar6, G. Maneva18, K. Mannheim1, O. Mansutti13, M. Mariotti7, M. Martínez2, D. Mazin6, C. Merck6, M. Meucci14, M. Meyer1, J. M. Miranda4, R. Mirzoyan6, S. Mizobuchi6, A. Moralejo2, D. Nieto4, K. Nilsson17, J. Ninkovic6, E. Oña-Wilhelmi2, N. Otte6,16, I. Oya4, D. Paneque6, M. Panniello12, R. Paoletti14, J. M. Paredes10, M. Pasanen17, D. Pascoli7, F. Pauss3, R. Pegna14, M. Persic13,19, L. Peruzzo7, A. Piccioli14, M. Poller1, E. Prandini7, N. Puchades2, A. Raymers11, W. Rhode8, M. Ribó10, J. Rico2, M. Rissi3, A. Robert5, S. Rügamer1, A. Saggion7, A. Sánchez5, P. Sartori7, V. Scalzotto7, V. Scapin13, R. Schmitt1, T. Schweizer6, M. Shayduk6,16, K. Shinozaki6, S. N. Shore20, N. Sidro2, A. Sillanpää17, D. Sobczynska9, A. Stamerra14, L. S. Stark3, L. Takalo17, P. Temnikov18, D. Tescaro2, M. Teshima6, N. Tonello6, D. F. Torres2,21, N. Turini14, H. Vankov18, V. Vitale13, R. M. Wagner6, T. Wibig9, W. Wittek6, F. Zandanel7, R. Zanin2, and J. Zapatero5
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 60 GeV and 9 TeV. The energy spectrum can be described by a curved power law dF/dE = f0(E/300 GeV)[a+blog10(E/300 GeV)] with a flux normalization f0 of (6.0 ± 0.2stat) × 10−10 cm−2 s−1 TeV−1, a = − 2.31 ± 0.06stat, and b = − 0.26 ± 0.07stat. The peak in the spectral energy distribution is estimated at 77 ± 35 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 pulsed spectrum to be less than 27 GeV, assuming that the differential energy spectrum has an exponential cutoff. For a superexponential shape, the cutoff energy can be as high as 60 GeV.