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Karlsruhe 2011 – scientific programme

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T: Fachverband Teilchenphysik

T 109: Experimentelle Techniken der Astroteilchenphysik I

T 109.9: Talk

Monday, March 28, 2011, 18:50–19:05, 30.95: 001

Observations of the Crab pulsar with the MAGIC telescope — •Takayuki Saito1, Thomas Schweizer1, Maxim Shayduk2, Nepomuk Otte3, Michael Rissi4, Razmick Mirzoyan1, Eckart Lorenz5, and Masahiro Teshima11Max-Planck-Institut fuer Physik, Muenchen, Germany — 2DESY Zeuthen, Germany — 3University of California, Santa Cruz, USA — 4Universitetet i Oslo, Norway — 5ETH Zurich, Switzerland

The MAGIC telescope detected the Crab pulsar above 25 GeV in winter 2007/2008 with the new analogue sum trigger system. It was the first detection of a pulsar by a ground based gamma-ray detector. Later measurements in 2008/2009 confirmed the first observation.

In August 2008, the satellite borne gamma-ray detector, Fermi-LAT, started operation and it measured the energy spectrum of the Crab pulsar from 100 MeV to approx. 30 GeV. The Fermi-LAT-measured spectrum is well described by a power law with an exponential cutoff at around 5 GeV.

Here we will present the comparison of the energy spectra measured by Fermi-LAT and by MAGIC and discuss reasons for the differences.

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