用MAGIC望远镜观测月光和黄昏时的甚高能γ射线
Observations of Very High Energy Gamma-Rays during Moonlight and Twilight with the MAGIC Telescope
摘要：
我们研究MAGIC望远镜在中等月光下观测的能力。MAGIC望远镜在月球位于地平线以上和黄昏时探测到蟹状星云发出的TeV伽马射线信号。这是通过增加触发阈值来实现的。无需更改高压设置，因为摄像机PMT经过专门设计，可避免高电流。我们通过研究月光对伽马射线探测效率和灵敏度以及能量阈值的影响来表征望远镜的性能。
英文摘要：
We study the capability of the MAGIC telescope to observe under moderate moonlight. TeV gamma-ray signals from the Crab nebula were detected with the MAGIC telescope during periods when the Moon was above the horizon and during twilight. This was accomplished by increasing the trigger discriminator thresholds. No change is necessary in the high voltage settings since the camera PMTs were especially designed to avoid high currents. We characterize the telescope performance by studying the effect of the moonlight on the gamma-ray detection efficiency and sensitivity, as well as on the energy threshold.
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