标题： 升级和测试由成像大气切伦科夫望远镜阵列观测到的伽马射线空气秀的三维重建 显示英文标题

标题： Upgrading and testing the 3D reconstruction of gamma-ray air showers as observed with an array of Imaging Atmospheric Cherenkov telescopes

摘要： 成像大气切伦科夫望远镜的立体阵列允许以三维方式重建伽马射线诱导的空气簇射，这带来了几个优势：直接访问空间中的簇射参数，并且能够直接测量入射能量。此外，还考虑了同一簇射不同图像之间的相关性。最近，一种基于简单三维电磁簇射模型的分析方法在H.E.S.S.实验框架内得以实现。在本文中，该方法通过一个额外的质量标准得以完善，在扩展源的情况下，可将背景污染减少约一半，同时保持伽马射线效率处于高水平。另一方面，2006年7月耀变体PKS 2155-304的剧烈爆发提供了几乎纯伽马射线样本的H.E.S.S.数据，这为三维重建方法以及用于校准的H.E.S.S.模拟提供了一次精度测试的独特机会。对于所有三维簇射参数的分布，数据与模拟之间在百分之几的水平上达成一致。 显示英文摘要

摘要： Stereoscopic arrays of Imaging Atmospheric Cherenkov Telescopes allow to reconstruct gamma-ray-induced showers in 3 dimensions, which offers several advantages: direct access to the shower parameters in space and straightforward calorimetric measurement of the incident energy. In addition, correlations between the different images of the same shower are taken into account. An analysis method based on a simple 3D-model of electromagnetic showers was recently implemented in the framework of the H.E.S.S. experiment. In the present article, the method is completed by an additional quality criterion, which reduces the background contamination by a factor of about 2 in the case of extended sources, while keeping gamma-ray efficiency at a high level. On the other hand, the dramatic flares of the blazar PKS 2155-304 in July 2006, which provided H.E.S.S. data with an almost pure gamma-ray sample, offered the unique opportunity of a precision test of the 3D-reconstruction method as well as of the H.E.S.S. simulations used in its calibration. An agreement at a few percent level is found between data and simulations for the distributions of all 3D shower parameters.