HESS J1023-575: Non-thermal Particle Acceleration Associated with a Young Stellar Cluster

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Gamma-Ray Sources, Gamma-Ray Bursts, Stellar Clusters And Associations, Particle Acceleration, Hii Regions, Emission And Reflection Nebulae

Scientific paper

The detection of very-high-energy gamma-ray emission associated with the young stellar cluster Westerlund 2 in the HII complex RCW 49 by H.E.S.S. provides ample evidence that particle acceleration to extreme energies is associated with this region. The results from the H.E.S.S. observations towards Westerlund 2 are presented. A variety of potential emission scenarios has been laid out, ranging from high-energy gamma-ray production in the colliding wind zone of the massive Wolf-Rayet binary WR 20a, collective wind scenarios, diffusive shock acceleration at the boundaries of wind-blown bubbles in the stellar cluster, and outbreak phenomena from hot stellar winds into the interstellar medium. These scenarios are compared to the characteristics of the recently detected VHE gamma-ray source HESS J1023-575, and conclusions on the validity of existing emission scenarios for high-energy gamma-ray production are drawn.

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