论文标题
在云的存在下，通过成像Air Cherenkov望远镜以非常高的能量成像的数据分析方法
An analysis method for data taken by Imaging Air Cherenkov Telescopes at very high energies under the presence of clouds
论文作者
论文摘要
成像Air Cherenkov望远镜（IACT）的有效观察时间在检测伽马射线源中起着重要作用，尤其是当预期通量较低时。这次受到大气条件的强烈限制。由云的存在引起的Cherenkov光的显着灭绝会降低光子检测率，甚至使不可能的数据分析变得复杂，甚至使其变得复杂。但是，对于具有相对较高大气传播的云，高能量淋浴仍然可以产生足够的Cherenkov光子以通过IACTS检测。在本文中，我们研究了针对不同云传播的一系列小型望远镜的检测能力的降解。我们显示了能量偏置，能量和角度分辨率的预期变化以及由位于观测水平高2.5和4.5 km的吸收层引起的有效收集区域。我们展示了重建能量和有效收集区域的简单校正方法。结果，在云存在期间观察到的源通量的系统误差小于20％。最后，我们表明，所提出的校正方法可用于高于5 km A.S.l的高度的云。结果，对某些云状条件下采取的数据的分析将不需要额外的耗时耗时的蒙特卡洛模拟。
The effective observation time of Imaging Air Cherenkov Telescopes (IACTs) plays an important role in the detection of gamma-ray sources, especially when the expected flux is low. This time is strongly limited by the atmospheric conditions. Significant extinction of Cherenkov light caused by the presence of clouds reduces the photon detection rate and also complicates or even makes impossible proper data analysis. However, for clouds with relatively high atmospheric transmission, high energy showers can still produce enough Cherenkov photons to allow their detection by IACTs. In this paper, we study the degradation of the detection capability of an array of small-sized telescopes for different cloud transmissions. We show the expected changes of the energy bias, energy and angular resolution and the effective collection area caused by absorption layers located at 2.5 and 4.5 km above the observation level. We demonstrate simple correction methods for reconstructed energy and effective collection area. As a result, the source flux that is observed during the presence of clouds is determined with a systematic error of < 20%. Finally, we show that the proposed correction method can be used for clouds at altitudes higher than 5 km a.s.l.. As a result, the analysis of data taken under certain cloudy conditions will not require additional time-consuming Monte Carlo simulations.
