Be Li

Interpreting the $\gamma$-ray emission from Westerlund 1: hadronic or leptonic?

High-energy $\gamma$-ray emission has been detected from several star clusters, indicating that these sources are sites of cosmic-ray acceleration. However, it is still unclear whether the $\gamma$-ray emission is of hadronic or leptonic origin. We present a comprehensive study of the $\gamma$-ray emission from Westerl...