Effectiveness of TeV gamma-ray observations at large zenith angles with a stereoscopic system of imaging atmospheric Cerenkov telescopes
Effectiveness of TeV gamma-ray observations at large zenith angles with a stereoscopic system of imaging atmospheric Cerenkov telescopes
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使用大气切伦科夫成像望远镜立体系统进行大天顶角 TeV 伽马射线观测的有效性
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发表时间：
1999
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通讯作者：
H. Voelk
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作者：
A. Konopelko;F. Aharonian;M. Hemberger;W. Hofmann;J. Kettler;G. Puehlhofer;H. Voelk
成像大气切伦科夫望远镜（IACTs）在TeV射线观测中的灵敏度在小天顶角（SZAs）（30 o）处达到最大，这提供了仪器可达到的最小能量阈值。然而，对于一个特定的望远镜网站的一些射线源，或源候选人，只能在更大的天顶角（LZAs）（60 o）观察。此外，在LZAs的观测使我们能够延长观测时间窗口的任何对象看到的SZAs，以及扩大动态能量范围的仪器对最高可观测能量的射线。基于蒙特卡罗模拟，我们给出了五个IACT立体系统在LZA观测中的灵敏度结果。我们指出了一些重要的参数的望远镜设计，这可以大大提高效率的观测与即将到来的IACT阵列，如CANGAROO III，HESS和VERITAS。
The sensitivity of imaging atmospheric Cerenkov telescopes (IACTs) in TeV -ray observations reaches its maximum at small zenith angles (SZAs) ( 30o) which provides the minimum attainable energy threshold of an instrument. However, for a specific telescope site a number of -ray sources, or source candidates, can only be observed at much larger zenith angles (LZAs) ( 60o). Moreover, the observations at LZAs allow us to extend the observation time window for any object seen at SZAs, as well as to enlarge the dynamic energy range of an instrument towards the highest observable energies of -rays. Based on Monte Carlo simulations we present the results on the sensitivity of a stereoscopic system of five IACTs in observations at LZAs. We point out some important parameters of the telescope design which could substantially improve the efficiency of such observations with forthcoming IACT arrays like CANGAROO III, HESS and VERITAS.