超高能宇宙射线磁偏转多重线超星系结构的证据
Evidence for a Supergalactic Structure of Magnetic Deflection Multiplets of Ultra-High Energy Cosmic Rays
摘要：
利用望远镜阵列（TA）表面探测器7年的数据，报告了能量超过10 $^{19}$ eV的超高能宇宙线（UHECR）的大尺度超星系宇宙线多重态（到达方向与能量相关）结构的证据，并更新为10年。先前的能量-位置相关性研究已经对磁场形状和强度以及UHECR成分做出了假设。这里测试的假设是，由于超星系平面是一个适合的平均物质密度的本地大尺度结构（LSS），UHECR源和干预河外磁场与此平面。这一超星系偏转假说是由整个视场（FOV）的中等规模的能量角相关的强度的行为进行测试。在FOV的球冠截面箱（楔形）中测量这些多重峰，以解释相干和随机磁场。发现的结构是一致的超星系偏转，以前发表的能谱各向异性的TA（热点和冷点）的结果，和玩具模型模拟的超星系磁片。在各向同性天空中偶然出现的这种多重态超星系结构的七年试验后数据的显著性由蒙特卡罗模拟发现为4.2 $σ$。试验后10年数据的显著性为4.1 $σ$。此外，星暴星系M82被证明是一个可能的源TA热点，并估计超星系磁场使用UHECR测量。
英文摘要：
Evidence for a large-scale supergalactic cosmic ray multiplet (arrival directions correlated with energy) structure is reported for ultra-high energy cosmic ray (UHECR) energies above 10$^{19}$ eV using seven years of data from the Telescope Array (TA) surface detector and updated to 10 years. Previous energy-position correlation studies have made assumptions regarding magnetic field shapes and strength, and UHECR composition. Here the assumption tested is that, since the supergalactic plane is a fit to the average matter density of the local Large Scale Structure (LSS), UHECR sources and intervening extragalactic magnetic fields are correlated with this plane. This supergalactic deflection hypothesis is tested by the entire field-of-view (FOV) behavior of the strength of intermediate-scale energy-angle correlations. These multiplets are measured in spherical cap section bins (wedges) of the FOV to account for coherent and random magnetic fields. The structure found is consistent with supergalactic deflection, the previously published energy spectrum anisotropy results of TA (the hotspot and coldspot), and toy-model simulations of a supergalactic magnetic sheet. The seven year data post-trial significance of this supergalactic structure of multiplets appearing by chance, on an isotropic sky, is found by Monte Carlo simulation to be 4.2$σ$. The ten years of data post-trial significance is 4.1$σ$. Furthermore, the starburst galaxy M82 is shown to be a possible source of the TA Hotspot, and an estimate of the supergalactic magnetic field using UHECR measurements is presented.
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