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arXiv 1608.04249astro-ph.HE
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用Cosmic Ray电子标定切伦科夫望远镜阵列

Calibration of the Cherenkov Telescope Array using Cosmic Ray Electrons

R. D. Parsons, J. A. Hinton, H. Schoorlemmer

摘要:

宇宙射线电子代表了切伦科夫望远镜观测伽马射线的背景,引发了难以与光子引发的簇射区分的空气簇射。然而,这种相似性,以及宇宙射线电子在每个观测场的存在,使得它们在校准方面非常有用。在这里,我们研究的精度与光子的相对能量规模和收集面积/效率可以建立使用电子的主要下一代仪器,如CTA。我们发现,在收集效率的变化小时的时间尺度上,可以校正到优于1%。此外,在~0.9 TeV的电子光谱中的断裂可以用来校准在相同的时间尺度上的3%水平的能量标度。对于小时量级的观测,统计误差在几TeV以下可以忽略不计,并允许与CALET和AMS等仪器进行能量尺度的交叉检查。因此,宇宙射线电子提供了一个强大的校准工具,无论是作为一种替代密集的大气监测和建模工作,或独立验证这些程序。

英文摘要:

Cosmic ray electrons represent a background for gamma-ray observations with Cherenkov telescopes, initiating air-showers which are difficult to distinguish from photon-initiated showers. This similarity, however, and the presence of cosmic ray electrons in every field observed, makes them potentially very useful for calibration purposes. Here we study the precision with which the relative energy scale and collection area/efficiency for photons can be established using electrons for a major next generation instrument such as CTA. We find that variations in collection efficiency on hour timescales can be corrected to better than 1%. Furthermore, the break in the electron spectrum at ~0.9 TeV can be used to calibrate the energy scale at the 3% level on the same timescale. For observations on the order of hours, statistical errors become negligible below a few TeV and allow for an energy scale cross-check with instruments such as CALET and AMS. Cosmic ray electrons therefore provide a powerful calibration tool, either as an alternative to intensive atmospheric monitoring and modelling efforts, or for independent verification of such procedures.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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