雅典娜WFI带电粒子背景的减少：来自Geant4模拟的结果
Reducing the Athena WFI charged particle background: Results from Geant4 simulations
摘要：
欧空局雅典娜X射线天文台上的宽视场成像仪的科学目标之一是绘制宇宙中的热气结构，如星系团和星系群以及星系间介质。对微弱漫射源的这些深度观测需要低背景和对该背景的尽可能好的了解。WFI背景工作组正从多个方向着手解决这一问题。在这里，我们提出了分析Geant 4模拟宇宙射线粒子与雅典娜上的结构相互作用，在WFI中产生信号。我们寻找这些粒子轨道和检测到的事件，否则将被归类为X射线之间的现象学相关性，并探讨如何利用这些相关性标记或拒绝在地面处理这样的事件。除了减少雅典娜WFI仪器背景外，这些结果还适用于了解太空中任何硅基X射线探测器中的粒子成分。
英文摘要：
One of the science goals of the Wide Field Imager (WFI) on ESA's Athena X-ray observatory is to map hot gas structures in the universe, such as clusters and groups of galaxies and the intergalactic medium. These deep observations of faint diffuse sources require low background and the best possible knowledge of that background. The WFI Background Working Group is approaching this problem from a variety of directions. Here we present analysis of Geant4 simulations of cosmic ray particles interacting with the structures aboard Athena, producing signal in the WFI. We search for phenomenological correlations between these particle tracks and detected events that would otherwise be categorized as X-rays, and explore ways to exploit these correlations to flag or reject such events in ground processing. In addition to reducing the Athena WFI instrumental background, these results are applicable to understanding the particle component in any silicon-based X-ray detector in space.
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