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Paper: H.E.S.S. Observations of Massive Stellar Clusters
Volume: 422, High Energy Phenomena in Massive Stars
Page: 265
Authors: Ohm, S.; Horns, D.; Reimer, O.; Hinton, J.; Rowell, G.; Wilhelmi, E. O.; Fernandes, M. V.; Acero, F.; Marcowith, A.
Abstract: Stellar clusters are potential acceleration sites of very-high-energy (VHE, E > 100GeV) particles since they host supernova remnants (SNRs) and pulsar wind nebulae (PWNe). Additionally, in stellar clusters, particles can also be accelerated e.g. at the boundaries of wind-blown bubbles, in colliding wind zones in massive binary systems or in the framework of collective wind or wind/supernova(SN) ejecta scenarios. Motivated by the detection of VHE γ-ray emission towards Westerlund 2 and assuming similar particle acceleration mechanisms at work, Westerlund 1 is an even more promising target for VHE γ-ray observations given that massive star content and distance are more favorable for detectable VHE γ-ray emission compared to Westerlund 2. Here, H.E.S.S. observations of massive stellar clusters in general with special emphasis on the most massive stellar cluster in the galaxy, Westerlund 1 are summarized.
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