标题： X射线中的年轻大质量恒星团西德兰1在$γ$ rays 中如 H.E.S.S 所见 显示英文标题

标题： The young massive stellar cluster Westerlund 1 in $γ$ rays as seen with H.E.S.S

摘要： 大质量星团最近被假定为加速强子宇宙射线至拍电子伏特能量的候选者。 此前，H.E.S.S. 合作组报告了围绕韦斯特兰德 1 的非常扩展的$\gamma$射线辐射，韦斯特兰德 1 是银河系中的一个大质量年轻星团。 在本次贡献中，我们展示了一种更新的分析，该分析采用了一种新的分析技术，并基于一个更大的数据集，使我们能够更好地约束辐射的形态和能量谱。 所使用的分析技术是一种三维似然分析，这特别适合于大面积扩展源。 将结合多波长观测来讨论$\gamma$射线辐射的起源。 显示英文摘要

摘要： Massive stellar clusters have recently been hypothesised as candidates for the acceleration of hadronic cosmic rays up to PeV energies. Previously, the H.E.S.S. Collaboration has reported about very extended $\gamma$-ray emission around Westerlund 1, a massive young stellar cluster in the Milky Way. In this contribution we present an updated analysis that employs a new analysis technique and is based on a much larger data set, allowing us to constrain better the morphology and the energy spectrum of the emission. The analysis technique used is a three-dimensional likelihood analysis, which is especially well suited for largely extended sources. The origin of the $\gamma$-ray emission will be discussed in light of multi-wavelength observations.