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V-shaped Cherenkov images of magnetically-separated gamma-rays
Astroparticle Physics ( IF 3.5 ) Pub Date : 2020-01-01 , DOI: 10.1016/j.astropartphys.2019.07.003
Julian Sitarek , Dorota Sobczyńska , Katarzyna Adamczyk , Michał Szanecki

Abstract Cherenkov Telescope Array (CTA) is an upcoming instrument that will start a new generation of atmospheric Cherenkov telescopes. CTA is expected not only to provide an unprecedented sensitivity in the tens of GeV to hundreds of TeV range, but also to considerably improve the systematic uncertainties of the measurements. We study the images registered by Cherenkov telescopes from low energy gamma rays with its first interaction in the upper parts of the atmosphere. The images show a characteristic separation due to the deflection of the first e − e + pair in the Geomagnetic Field. We evaluate the performance of the standard stereoscopic analysis for such events. We derive also a novel method for energy estimation of V-shaped events based purely on geometrical properties of the image. We investigate the potential of combining the classical energy estimation and the novel method for independent validation of the systematic shifts in the energy scale of Cherenkov telescopes and discuss the limitations of such analysis.

中文翻译:

磁分离伽马射线的 V 形切伦科夫图像

摘要 切伦科夫望远镜阵列(CTA)是一种即将推出的仪器,将启动新一代大气切伦科夫望远镜。CTA 不仅有望在数十 GeV 到数百 TeV 范围内提供前所未有的灵敏度,而且还可以显着改善测量的系统不确定性。我们研究了切伦科夫望远镜从低能伽马射线记录的图像,其第一次相互作用是在大气上部。由于地磁场中第一个 e - e + 对的偏转,图像显示了特征分离。我们评估此类事件的标准立体分析的性能。我们还推导出了一种新的 V 形事件能量估计方法,该方法完全基于图像的几何特性。
更新日期:2020-01-01
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