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T: Teilchenphysik

T 306: Kosmische Strahlung II

T 306.5: Talk

Tuesday, March 28, 2006, 17:40–17:55, HG2-HS3

Observations of extragalactic sources above 100 GeV with the MAGIC — •Thomas Bretz — Universität Würzburg, Am Hubland, 97074 Würzburg

During its first year of scheduled observations, more than 20 extragalactic sources have been observed with the MAGIC telescope, including active galactic nuclei such as Mrk421 and Mrk501, the radio galaxy M87, and gamma ray bursts in their prompt phase. As of November 2005, five active galactic nuclei have been significantly detected for the first time at 100 GeV energies. Four of them are known TeV gamma ray emitters. The observations will guide us to understand particle acceleration in extreme environments, and will provide clues on the metagalactic radiation field responsible for cosmological gamma ray attenuation.