HESS II使用ImPACT进行数据分析
HESS II Data Analysis with ImPACT
摘要：
高能立体系统（H.E.S.S.）甚高能伽马射线望远镜阵列在现有4台望远镜的中心增加了第五台$^{2}$镜面积为600米的望远镜，将其能量阈值降低到100 GeV以下的范围，并成为第一个使用多种望远镜设计的运行中的IACT阵列。然而，为了正确地访问这个低能量范围，必须对现有的事件分析进行一些调整。我们提出了一个适应的高性能事件重建算法，图像像素适合大气切伦科夫望远镜（ImPACT），执行单声道和立体声事件重建与H.E.S.S. II阵列。重建算法是基于相机像素幅度到预期图像模板的似然拟合，直接从蒙特卡罗模拟生成。这种先进的重建相结合的多变量分析为基础的背景拒绝计划，以提供一个敏感和稳定的分析方案，在子100 GeV的伽马射线能量范围。我们将介绍模拟和真实H.E.S.S.的ImPACT分析的最新结果。II数据，证明了在最低能量下ImPACT分析的行为。
英文摘要：
The High Energy Stereoscopic System (H.E.S.S.) very high energy gamma-ray telescope array has added a fifth telescope of 600 m$^{2}$ mirror area to the centre of the 4 existing telescopes, lowering its energy threshold to the sub-100 GeV range and becoming the first operational IACT array using multiple telescope designs. In order to properly access this low-energy range however, some adaptation must be made to the existing event analysis. We present an adaptation of the high-performance event reconstruction algorithm, Image Pixelwise fit for Atmospheric Cherenkov Telescopes (ImPACT), for performing mono and stereo event reconstruction with the H.E.S.S. II array. The reconstruction algorithm is based around the likelihood fitting of camera pixel amplitudes to an expected image template, directly generated from Monte Carlo simulations. This advanced reconstruction is combined with a multi variate analysis based background rejection scheme to provide a sensitive and stable analysis scheme in the sub-100 GeV gamma-ray energy range. We will present the latest results of the ImPACT analysis on both simulated and real H.E.S.S. II data, demonstrating the behaviour of the ImPACT analysis at the lowest energies.
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