Freiburg 2008 – scientific programme

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EP: Fachverband Extraterrestrische Physik

EP 15: Astrophysics III

EP 15.1: Talk

Thursday, March 6, 2008, 14:00–14:15, KGI-Aula

MAGIC Telescope observations of high energy gamma-rays from globular cluster M13 — •Julian Sitarek^1,2, Tobias Jogler¹, and Wlodek Bednarek² for the MAGIC collaboration — ¹Max-Planck-Institut für Physik, München, Germany — ²Division of Experimental Physics, University of Lodz, Lodz, Poland

Globular clusters are quite compact (size ∼ 10 pc) objects distributed spherically around the galaxy. They contain about 10⁵ - 10⁶ mostly old stars. The number of milisecond pulsars in typical globular cluster is expected to be large (of the order of 100). We investigate the possible mechanism of production of high energy gamma-rays in those objects. Part of the wind energy of pulsars (energy conversion factor) is converted into relativistic leptons. Those leptons can upscatter in inverse Compton process low energy starlight and CMB photons and produce gamma-rays.

MAGIC is an Imaging Atmospheric Cerenkov Telescopes located at Canary island of La Palma. We present results and discussion of the MAGIC observations of globular cluster M13.