论文标题
UHECR质量组成在其到达方向的各向异性的最高能量
UHECR mass composition at highest energies from anisotropy of their arrival directions
论文作者
论文摘要
我们提出了一种从其到达方向的分布中估算超高能宇宙射线（UHECR）质量组成的新方法。该方法基于在本地宇宙中发光物质的分布基于UHECR事件的特征偏转采用测试统计量（TS）。对模拟UHECR集进行了逼真的模拟，我们表明该TS对于存在银河系和非高级式磁场的存在是强大的，并且对集合中事件的质量组成敏感。这使人们可以通过将所讨论的组合模型的TS分布与数据TS进行比较，并区分不同组合模型来限制UHECR质量组成。尽管该方法的统计能力在一定程度上取决于MF参数，但这种依赖性随统计的增长而降低。该方法即使在GZK能量中也表现出良好的性能，在GZK能量中，使用传统方法对Uhcer质量组成的估计也使低统计数据变得复杂。
We propose a new method for the estimation of ultra-high energy cosmic ray (UHECR) mass composition from a distribution of their arrival directions. The method employs a test statistic (TS) based on a characteristic deflection of UHECR events with respect to the distribution of luminous matter in the local Universe. Making realistic simulations of the mock UHECR sets, we show that this TS is robust to the presence of galactic and non-extreme extra-galactic magnetic fields and sensitive to the mass composition of events in a set. This allows one to constrain the UHECR mass composition by comparing the TS distribution of a composition model in question with the data TS, and to discriminate between different composition models. While the statistical power of the method depends somewhat on the MF parameters, this dependence decreases with the growth of statistics. The method shows good performance even at GZK energies where the estimation of UHCER mass composition with traditional methods is complicated by a low statistics.
