论文标题
在望远镜阵列实验中观察到的超高能量宇宙射线的到达方向上搜索大规模各向异性
Search for Large-scale Anisotropy on Arrival Directions of Ultra-high-energy Cosmic Rays Observed with the Telescope Array Experiment
论文作者
论文摘要
由Pierre Auger天文台报道的超过8 EEV的超高能量宇宙射线的到达方向检测出明显的偶极结构的动机,我们使用与望远镜阵列实验的表面检测器阵列收集的大规模各向异性(TA)。使用11年的TA数据,右升升投影的偶极结构的振幅为3.3 +-1.9%,相位为131 +-33度。振幅上相应的99%置信度上限为7.3%。在目前的统计水平上,拟合结果与各向同性分布和auger报告的偶极结构兼容。
Motivated by the detection of a significant dipole structure in the arrival directions of ultrahigh-energy cosmic rays above 8 EeV reported by the Pierre Auger Observatory (Auger), we search for a large-scale anisotropy using data collected with the surface detector array of the Telescope Array Experiment (TA). With 11 years of TA data, a dipole structure in a projection of the right ascension is fitted with an amplitude of 3.3+- 1.9% and a phase of 131 +- 33 degrees. The corresponding 99% confidence-level upper limit on the amplitude is 7.3%. At the current level of statistics, the fitted result is compatible with both an isotropic distribution and the dipole structure reported by Auger.