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Conf. on High Energy Phenomena in Massive Stars, Jaen : Espagne (2009)
H.E.S.S. observations of massive stellar clusters
Stefan Ohm, Dieter Horns, Olaf Reimer, Jim Hinton, Gavin Rowell, Emma De Oña Wilhelmi, Milton Virgilio Fernandes, Fabio Acero1, Alexandre Marcowith1

Stellar clusters are potential acceleration sites of very-high-energy (VHE, E> 100GeV) particles since they host supernova remnants (SNRs) and pulsar windnebulae (PWNe). Additionally, in stellar clusters, particles can also beaccelerated e.g. at the boundaries of wind-blown bubbles, in colliding windzones in massive binary systems or in the framework of collective wind orwind/supernova(SN) ejecta scenarios. Motivated by the detection of VHEgamma-ray emission towards Westerlund 2 and assuming similar particleacceleration mechanisms at work, Westerlund 1 is an even more promising targetfor VHE gamma-ray observations given that massive star content and distance aremore favorable for detectable VHE gamma-ray emission compared to Westerlund 2.Here, H.E.S.S. observations of massive stellar clusters in general with specialemphasis on the most massive stellar cluster in the galaxy, Westerlund 1 aresummarized.
1 :  LPTA - Laboratoire de Physique Théorique et Astroparticules
Planète et Univers/Astrophysique/Phénomènes cosmiques de haute energie
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