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T: Fachverband Teilchenphysik
T 94: Gammaastronomie III
T 94.8: Vortrag
Mittwoch, 17. März 2010, 15:45–16:00, HG VII
observations of westerlund 2 with the H.E.S.S. telescope — •Emma de Ona Wilhelmi1, Andreas Foerster1, and Olaf Reimer2 — 1Max-Planck-Institut fur Kernphysik, P.O. Box 103980, D 69029 Heidelberg, Germany — 2Institut fur Astro- und Teilchenphysik, Leopold-Franzens-Universitat Innsbruck, A-6020 Innsbruck
The observations of the field of view of Westerlund 2 with the H.E.S.S. telescopes have led to the discovery of an extended VHE source, HESS J1023-575, that has been previously associated with either the massive WR binary system WR 20a, the young stellar cluster Westerlund 2 or cosmic rays accelerated in bubbles or at their termination shock and interacting with their environment. The extension and non-variability of the VHE source disfavour the two first scenario and an unambiguous identification of the source is still on hold. The Fermi satellite also showed recently two bright gamma-ray pulsars in the same region. In order to investigate the origin of the VHE emission, re-observations have been performed with the H.E.S.S. telescope during 2008 and 2009. These new results shed light on the identification and morphology of HESS J1023-575. We will present the new H.E.S.S. observations and discuss the possible counterpart