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arXiv 1105.0282astro-ph.IMastro-ph.COastro-ph.GAastro-ph.HE
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multi-TeV gamma ray天文学在大核心距离的定时分析技术

Timing analysis techniques at large core distances for multi-TeV gamma ray astronomy

V. Stamatescu, G. P. Rowell, J. Denman, R. W. Clay, B. R. Dawson, A. G. K. Smith, T. Sudholz, G. J. Thornton, N. Wild

摘要:

我们提出了一种分析技术,使用广泛的空气淋浴(EAS)的切伦科夫图像的定时信息。我们的重点是在遥远的,或大核心距离伽马射线诱导的阵雨在多TeV的能量。具体而言,结合像素定时信息与改进的方向重建算法,导致角和核心分辨率的改善高达~40%和~ 30%,分别与相同的算法相比,没有使用定时。在10 TeV以上,这导致接近0.05度的角分辨率,以及优于~15 m的核心分辨率。离轴切割后伽马射线接受度与能量有关,其半峰全宽范围为4度至8度。对于离轴高达~6度的簇射方向,通过使用定时信息实现的角分辨率与轴上角分辨率相当,大约为100 TeV。我们在这里描述的望远镜规格和布局是针对10 TeV以上的能量的。然而,只要有合适的望远镜参数,这些方法原则上也可以应用于其他能量。这项研究中研究的5台望远镜单元最初可以为更大的稀疏望远镜阵列铺平道路,以努力将收集面积推到>10平方公里。这些结果突出了“稀疏阵列”方法在有效打开10 TeV以上能量范围方面的潜力。

英文摘要:

We present an analysis technique that uses the timing information of Cherenkov images from extensive air showers (EAS). Our emphasis is on distant, or large core distance gamma-ray induced showers at multi-TeV energies. Specifically, combining pixel timing information with an improved direction reconstruction algorithm, leads to improvements in angular and core resolution as large as ~40% and ~30%, respectively, when compared with the same algorithm without the use of timing. Above 10 TeV, this results in an angular resolution approaching 0.05 degrees, together with a core resolution better than ~15 m. The off-axis post-cut gamma-ray acceptance is energy dependent and its full width at half maximum ranges from 4 degrees to 8 degrees. For shower directions that are up to ~6 degrees off-axis, the angular resolution achieved by using timing information is comparable, around 100 TeV, to the on-axis angular resolution. The telescope specifications and layout we describe here are geared towards energies above 10 TeV. However, the methods can in principle be applied to other energies, given suitable telescope parameters. The 5-telescope cell investigated in this study could initially pave the way for a larger array of sparsely spaced telescopes in an effort to push the collection area to >10 km2. These results highlight the potential of a `sparse array' approach in effectively opening up the energy range above 10 TeV.

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