JEM-EUSO对超高能Cosmic Ray通量中包绕涨落的敏感性
Sensitivity of JEM-EUSO to Ensemble Fluctuations in the Ultra-High Energy Cosmic Ray Flux
摘要：
超高能宇宙射线（CR）的通量取决于其源的宇宙分布。来自CR观测的数据还不能确定它们的确切位置或分布，但提供了这些发射体的平均局部密度的测量。由于辐射源的离散性，预计通量将在统计变化之上显示出系综波动，这是宇宙方差的反映。由于在宇宙辐射背景中传播距离有限，这种效应对于能量最高的宇宙射线最强，因此是局部现象。在这项工作中，我们研究了JEM-EUSO空间任务的敏感性，系综波动的假设均匀分布的源，与本地源密度\sim 10^{-5} Mpc^{-3}。我们表明，在3年的观测JEM-EUSO将能够探测合奏波动，如果最近的源是在3 Mpc的，并在10年后绕地球轨道运行，这个探路者任务将成为敏感的合奏波动，如果最近的源是10 Mpc的距离。从局部源分布的光谱起伏的研究是补充，但独立于宇宙线各向异性研究。
英文摘要：
The flux of ultra-high energy (UHE) cosmic rays (CRs) depends on the cosmic distribution of their sources. Data from CR observations are yet inconclusive about their exact location or distribution, but provide a measure for the average local density of these emitters. Due to the discreteness of the emitters the flux is expected to show ensemble fluctuations on top of the statistical variations, a reflection of the cosmic variance. This effect is strongest for the most energetic cosmic rays due to the limited propagation distance in the cosmic radiation background and is hence a local phenomenon. In this work we study the sensitivity of the JEM-EUSO space mission to ensemble fluctuations on the assumption of uniform distribution of sources, with local source density \sim 10^{-5} Mpc^{-3}. We show that in 3 years of observation JEM-EUSO will be able to probe ensemble fluctuations if the nearest sources are at 3 Mpc, and that after 10 years orbiting the Earth, this pathfinder mission will become sensitive to ensemble fluctuations if the nearest sources are 10 Mpc away. The study of spectral fluctuations from the local source distributions are complementary to but independent of cosmic ray anisotropy studies.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
