Karlsruhe 2011 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 109: Experimentelle Techniken der Astroteilchenphysik I

T 109.9: Vortrag

Montag, 28. März 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 Teshima¹ — ¹Max-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.