Extreme Phenomena in the Universe Explored by Highest Energy Cosmic Rays

美国犹他州的望远镜阵列(TA)实验测量了超高能宇宙线(UHECR)。在5年的观测中，我们收集了8万多个能量在10^&lt；18&gt；到10^&lt；20&gt；电子伏特(EV)之间的空气簇射样本。对这些事件的分析表明，它们作为河外起源的质子是一致的，它们的到达方向在10^&lt；19.76；ev以上变得强烈的各向异性。在未来的观测中，我们的目标是确定UHECRs的来源天文天体，并研究其加速机制。

Ultra-high energy cosmic rays (UHECRs) have been measured by the Telescope Array (TA) experiment installed in Utah, USA. We collected more than 80,000 samples of air showers with energies between 10^<18> and 10^<20> electron Volts (eV) in 5 years of observation. Analyses of these events indicated that they are consistent as being protons of extra-galactic origin, and their arrival directions become strongly anisotropic above 10^<19.76> eV. In future observations, we aim to pin down the sourcing astronomical object of UHECRs, and to investigate its acceleration mechanism.