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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
(02/02/2009)

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
Lien vers le texte intégral : 
http://fr.arXiv.org/abs/0906.2637