磁分离伽马射线的V形切伦科夫像
V-shaped Cherenkov images of magnetically-separated gamma-rays
摘要：
切伦科夫望远镜阵列（CTA）是一个即将到来的仪器，将开始新一代的大气切伦科夫望远镜。预计CTA不仅将提供数十GeV至数百TeV范围内前所未有的灵敏度，而且还将大大改善测量的系统不确定性。我们研究了切伦科夫望远镜记录的低能量伽马射线在大气层上部的第一次相互作用的图像。图像显示了由于第一个e-e+对在地磁场中偏转而产生的特征分离。我们评估的性能标准的立体分析，这样的事件。我们还推导出一种新的方法，纯粹基于图像的几何性质的V形事件的能量估计。我们调查的潜力相结合的经典能量估计和独立验证的切伦科夫望远镜的能量标度的系统性变化的新方法，并讨论这种分析的局限性。
英文摘要：
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.
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