A new template background estimate for source searching in TeV gamma-ray astronomy
A new template background estimate for source searching in TeV gamma-ray astronomy
复制标题
TeV伽马射线天文学源搜索的新模板背景估计
DOI：
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
G. Rowell
中科院分区：
文献类型：
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作者：
G. Rowell
描述了一种新的方法，它允许利用利用成象大气ˇ切伦科夫技术的仪器在大视场(6)上快速和容易地对TeV射线源进行二维搜索。它使用通常根据基于图像形状的宇宙线背景拒绝标准拒绝的事件作为背景估计，但重建的方向与感兴趣的源重叠。这个所谓的模板背景模型是使用ˇ切伦科夫望远镜的Hegra立体系统获取的示例数据来演示的。讨论包括与传统背景估计的比较以及该模型的局限性。模板模型非常适合于寻找类点、适度扩展的源及其组合，并很好地补偿了宇宙线背景响应的局部系统变化。
A new method is described that permits quickly and easily, a 2-dimensional search for TeV-ray sources over large fields of view (6) with instruments utilising the imaging atmospheric ˇ Cerenkov technique. It employs as a background estimate, events normally rejected according to a cosmic-ray background rejection criterion based on image shape, but with reconstructed directions overlapping the source of interest. This so-called template background model is demonstrated using example data taken with the stereoscopic HEGRA System of ˇ Cerenkov Telescopes. Discussion includes comparisons with a conventional background estimate and limitations of the model. The template model is well suited to the search for point-like, moderately extended sources and combinations thereof, and compensates well for localised systematic changes in cosmic-ray background response.