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A simulation of high-energy gamma-ray observations with imaging Cherenkov telescopes at high altitudes

机译：利用高空成像切伦科夫望远镜对高能伽玛射线观测进行模拟

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The performance of a single gamma-ray telescope is discussed based on the Imaging Atmospheric Cherenkov Technique (IACTech) at high altitudes. Observations at a high altitude are quite suitable for the IACTech because the density of Cherenkov light caused by gamma-rays is several-times larger than at sea level. To observe gamma-ray pulsars at high altitude, a gamma-ray camera, designated Chess (Cherenkov light detecting System on Subaru) based on the IACTech, has been developed for the Subaru infrared-optical telescope at an altitude of 4200 m. Using Chess, the Crab nebula/pulsar was observed for three days in December 2001. From a comparison between the simulated and observed shower events, it was found that the night-sky background (N.S.B.) and muon showers have significant effects on the detection rate below 80 GeV in spite of the small field of view (FOV) of Chess (0.75degrees). The simulated spectrum, which includes muon shower events, is consistent with the observed spectrum.Based on this study, the performance of a camera with a larger FOV of 3.0degrees is discussed. Although the effects of muon showers and the N.S.B. become serious, the simulation results indicate that an 8.2 m Imaging Atmospheric Cherenkov Telescope (IACT) with a FOV of 3.0degrees at an altitude of 4200 m could detect 15 GeV energy gamma-rays. (C) 2004 Elsevier B.V. All rights reserved.
机译：基于高空成像大气切伦科夫技术（IACTech），讨论了单个伽马射线望远镜的性能。在高空进行观测非常适合IACTech，因为伽马射线引起的切伦科夫光的密度是海平面的几倍。为了在高空观察伽马射线脉冲星，已经为IBATech开发了一种伽马射线照相机，该照相机基于IACTech，名为Chess（斯巴鲁的Cherenkov光检测系统），用于4200 m的斯巴鲁红外光学望远镜。使用国际象棋，在2001年12月对蟹状星云/脉冲星进行了三天的观测。通过对模拟和观测到的阵雨事件的比较，发现夜空背景（NSB）和μon阵雨对检出率具有重要影响。尽管国际象棋的视场（FOV）很小（0.75度），但仍低于80 GeV。模拟的光谱包括μ子淋雨事件，与观察到的光谱一致。基于此研究，讨论了具有3.0°较大FOV的相机的性能。虽然μ子淋浴和N.S.B.模拟结果变得越来越严重，模拟结果表明，在4200 m高度的FOV为3.0度的8.2 m成像切伦科夫望远镜（IACT）可以探测15 GeV能量伽马射线。 （C）2004 Elsevier B.V.保留所有权利。

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