使用H.E.S.S.的微秒时间分辨率光学光度法。切伦科夫望远镜
Microsecond Time Resolution Optical Photometry using a H.E.S.S. Cherenkov Telescope
摘要：
我们已经建立了一个具有微秒时间分辨率的光学光度计，目前正在一个H.E.S.S.上运行。望远镜H.E.S.S.是一个由四台切伦科夫望远镜组成的阵列，每台都有一个107平方米的镜子，位于纳米比亚的霍马斯高地。在其正常运行模式下，H.E.S.S.天文台观测到来自大气层上层高能伽马射线产生的空气簇射的切伦科夫光。我们的探测器由七个光电倍增管组成，其中一个位于中心，用于记录目标的光曲线，六个同心光电倍增管作为否决系统，用于拒绝干扰信号，例如来自地平线上的陨石或闪电。数据采集系统设计成连续记录零死区信号。对蟹状星云脉冲星的观测验证了仪器和GPS授时系统的性能。紧凑的星系目标被观察到在几微秒到100毫秒的时间尺度上寻找耀斑。介绍了仪器的设计、灵敏度和数据分析方法。
英文摘要：
We have constructed an optical photometer with microsecond time resolution, which is currently being operated on one of the H.E.S.S. telescopes. H.E.S.S. is an array of four Cherenkov telescopes, each with a 107 m^2 mirror, located in the Khomas highland in Namibia. In its normal mode of operation H.E.S.S. observes Cherenkov light from air showers generated by very high energy gamma-rays in the upper atmosphere. Our detector consists of seven photomultipliers, one in the center to record the lightcurve from the target and six concentric photomultipliers as a veto system to reject disturbing signals e.g. from meteorites or lightning at the horizon. The data acquisition system has been designed to continuously record the signals with zero deadtime. The Crab pulsar has been observed to verify the performance of the instrument and the GPS timing system. Compact galactic targets were observed to search for flares on timescales of a few microseconds to ~ 100 milliseconds. The design and sensitivity of the instrument as well as the data analysis method are presented.
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