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首页> 外文期刊>Journal of Cosmology and Astroparticle Physics >Anisotropies of ultra-high energy cosmic rays dominated by a single source in the presence of deflections
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Anisotropies of ultra-high energy cosmic rays dominated by a single source in the presence of deflections

机译：在存在偏转的情况下由单一来源主导的超高能量宇宙射线的各向异性

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This work presents a scenario of ultra-high energy cosmic ray source distribution where a nearby source is solely responsible for the anisotropies in arrival directions of cosmic rays while the rest of the sources contribute only isotropically. An analytical approach focused on large-scale anisotropies, which are influenced by deflections in a Kolmogorov-type turbulent magnetic field, is employed to provide more general results. When the recent Pierre Auger Observatory angular power spectrum above 8 EeV is used the restricted model gives, under the assumption of the small angle approximation, a solution where the RMS deflection with respect to the line of sight is α_(rms) = (50_(-10)~(+11))°, while the relative flux from the single source η = 0.03 ± 0.01. Furthermore, the solution can be translated into constraints on the source distance, luminosity, and extra-galactic magnetic field strength. For Centaurus A and the Virgo cluster the required relation between the coherence length and the RMS magnetic field strength is obtained: a coherence length of ~ 100 kpc would imply the RMS field strength around 1 nG for iron dominated and above 10 nG for proton dominated composition. We also performed trajectory simulations with our publicly available code CRPropa to show that our analytical model can serve as a good approximation as long as the deflections in cosmic magnetic fields can be described as a random walk. The simulations showed that generally structured fields tend to suppress large-scale anisotropies, especially the dipole, compared to anisotropies at smaller scales described by higher multipoles.
机译：这项工作提出了超高能量宇宙射线源分布的场景，其中附近的源仅对宇宙射线到达方向上的各向异性负责，而该源的其余部分仅贡献各向同性。专注于大规模各向同性的分析方法，其采用了Kolmogorov型湍流磁场中的偏转的影响，以提供更多的效果。当使用最近的Pierre螺旋钻天道角度功率谱时，使用限制模型在小角度近似的假设下给出了一个解决方案，其中RMS偏转相对于视线的偏转是α_（rms）=（50_（ -10）〜（+11））°，而来自单个源的相对通量η= 0.03±0.01。此外，可以将溶液转换为源距离，亮度和外层磁场强度的约束。对于Civeraurus A和Virgo集群获得相干长度和RMS磁场强度之间所需的关系：相干长度为〜100kpc将暗示RMS场强为铁杆占据1ng左右，用于质子主导组合物以上10 ng 。我们还通过我们公开的代码CRPropa进行了轨迹模拟，表明我们的分析模型可以作为良好的近似，只要可以将宇宙磁场中的偏转描述为随机步行即可。与通过更高的多元化的较小尺度的较小尺度的各向异性相比，模拟通常结构化的字段倾向于抑制大规模各向异性，特别是偶极子。

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