arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2001.06712astro-ph.IM
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监测FACT切伦科夫望远镜的光学质量

Monitoring the optical quality of the FACT Cherenkov Telescope

Laurits Tani

摘要:

在伽玛射线天文学中,μ子事件具有在传感器平面上投射环状图像的明显特征,从而形成切伦科夫望远镜的众所周知的信号类别。然后,这些环状图像可以用于推导光学点扩散函数(PSF),其是成像反射器的光学质量的重要度量。在这篇论文中,我们利用μ子环的观测值作为一个度量来推断点扩散函数。然而,要有一个很好的估计这个“模糊”参数,环中心和环半径本身的重建需要是准确的,所以不同的方法的环特征提取进行了研究。为了检查方法的准确性,进行了模拟和分析。测量点扩散函数随时间的演变可以识别其影响,并将其考虑在内,用于重建伽马射线。作为本文所述方法的另一个好处,不需要额外的观察来测量PSF,也不需要现场的任何人类活动。给出了该方法的精度和FACT随时间的PSF。

英文摘要:

In gamma ray astronomy muon events have a distinct feature of casting ring-like images on the sensor plane, thus forming a well known signal class for Cherenkov telescopes. These ring-like images can then be used to deduce the optical point spread function (PSF) which is an important measure of the optical quality of the imaging-reflector. In this thesis the observed 'fuzziness' of muon rings is used as a measure to infer the PSF. However to have a good estimate for this 'fuzziness' parameter, the reconstruction of the ring center and ring radius itself needs to be accurate, so different methods of ring feature extraction are studied. To check for the accuracy of the methods a simulation and analysis is performed. Measuring the evolution of the PSF over time allows to identify its effects and take them into account for the reconstruction of gamma-rays postliminary. As a further benefit of the methods presented here no additional observations are needed to measure the PSF nor any human activity on site is required. The accuracy of the method, and the PSF of FACT vs. time are presented.

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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