On the accuracy of determination of fluxes and energy spectra of primary gamma rays by a single imaging atmospheric Cherenkov telescope
On the accuracy of determination of fluxes and energy spectra of primary gamma rays by a single imaging atmospheric Cherenkov telescope
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单成像大气切伦科夫望远镜测定初级伽马射线通量和能谱的准确性
DOI：
10.1088/0954-3899/21/3/016
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发表时间：
1995
期刊：
影响因子：
--
通讯作者：
M. Ulrich
中科院分区：
文献类型：
--
作者：
F. Aharonian;W. Hofmann;A. Konopelko;A. Plyasheshnikov;M. Ulrich
大气切伦科夫成像望远镜（IACT）在硬件和软件层面对伽马射线探测效率的强烈能量依赖性，导致初级伽马射线通量的估计存在显着的不确定性。然而，对 IACTS 主要特征（特别是收集区域和伽马/质子分离效率）的详细蒙特卡罗计算，可以在绝对伽马射线通量的评估和幂律光谱的光谱指数的确定中实现相当高的精度。然而，单个 IACT 的能量分辨率较差，不允许我们明确区分初级伽马射线光谱中的锐截止等特征。扩展源在伽马射线通量的分离和确定中引起额外的问题。
The strong energy dependence of the detection efficiency of gamma -rays by imaging atmospheric Cherenkov telescopes (IACT) both at the hardware and software levels, leads to significant uncertainties in the estimate of primary gamma -ray fluxes. Nevertheless, detailed Monte Carlo calculations of the principal characteristics of IACTS, in particular of collection areas and of the gamma /proton separation efficiency, allow a rather high accuracy in the evaluation of the absolute gamma -ray fluxes and in the determination of the spectral index of power-law spectra. However, the poor energy resolution of a single IACT does not permit us to distinguish features such as sharp cutoffs in primary gamma -ray spectra unambiguously. Extended sources cause additional problems in the separation and determination of the gamma -ray flux.