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T: Fachverband Teilchenphysik

T 83: Gamma-Astronomie 2

T 83.9: Talk

Tuesday, March 10, 2009, 18:50–19:05, M218

MAGIC observations of the distant quasar 3c279 in 2006 and 2007 — •Karsten Berger¹, Pratik Majumdar², Elina Lindfors³, Elisa Prandini⁴, Manel Erando⁵, and Masahiro Teshima⁶ — ¹University Lodz, Lodz, Poland — ²Deutsches Elektronen-Synchrotron (DESY) Zeuthen, Germany — ³Tuorla Observatory, Piikiö, Finland — ⁴Dipartimento di Fisica, Università di Padova and INFN sez. di Padova, Italy — ⁵Institut de Física d'Altes Energies, Barcelona, Spain — ⁶Max-Planck-Institut für Physik, Munich, Germany

The flat-spectrum radio-quasar 3c279 (z=0.536) is the most distant object detected at Very High Energy (VHE) gamma-rays. It is thus an important beacon for the study of the interaction of the VHE gamma-rays with the Extra-galactic Background Light (EBL). Previous observations by EGRET showed a highly variable flux that can differ up to a factor of 100. In this talk first results from a new observation campaign during an optical flare in January 2007 will be presented and previous results from the 2006 observation campaign will be summarized.