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arXiv 1508.04575astro-ph.IM
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MAGIC望远镜重大升级后的性能

Performance of the MAGIC telescopes after the major upgrade

Julian Sitarek, Emiliano Carmona, Pierre Colin, Daniel Mazin, Diego Tescaro

摘要:

MAGIC是一个由两台切伦科夫大气成像望远镜组成的系统,位于西班牙的加那利群岛。在2011年和2012年夏天,它进行了重大升级。升级的主要分系统是MAGIC-I照相机及其触发系统和两台望远镜的读出系统。我们使用观测的蟹状星云采取低和中等天顶距评估的MAGIC立体声系统的关键性能参数。对于低天顶距观测,MAGIC望远镜的标准触发阈值约为50 GeV。在50小时的观测中,220 GeV以上类蟹状星云光谱的点源的积分灵敏度为蟹状星云通量的(0.66 +/- 0.03)%。角分辨率,定义为二维高斯分布的sigma,在几百GeV的能量下低于0.07度,而能量分辨率约为16%。我们调查了系统的不确定性对MAGIC望远镜升级后的数据的影响。我们估计,系统的不确定性可以分为以下几个部分:< 15%的能量标度,11 - 18%的通量归一化和+/-0.15的能谱的斜率。

英文摘要:

MAGIC is a system of two Imaging Atmospheric Cherenkov Telescopes located on the Canary island of La Palma, Spain. During summer 2011 and 2012 it underwent a major upgrade. The main subsystems upgraded were the MAGIC-I camera and its trigger system and the readout system of both telescopes. We use observations of the Crab Nebula taken at low and medium zenith angles to assess the key performance parameters of the MAGIC stereo system. For low zenith angle observations, the standard trigger threshold of the MAGIC telescopes is about 50 GeV. The integral sensitivity for point-like sources with Crab Nebula-like spectra above 220 GeV is (0.66 +/- 0.03)% of Crab Nebula flux in 50 h of observations. The angular resolution, defined as the sigma of a 2-dimensional Gaussian distribution, at energies of a few hundred GeV is below 0.07degree, while the energy resolution is around 16%. We investigate the effect of the systematic uncertainty on the data taken with the MAGIC telescopes after the upgrade. We estimate that the systematic uncertainties can be divided in the following components: < 15% in energy scale, 11 - 18% in flux normalization and +/-0.15 for the slope of the energy spectrum.

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