arXiv 0812.08602008-12astro-phhep-ph

超高能宇宙射线的大尺度各向同性测试

Testing large-scale (an)isotropy of ultra-high energy cosmic rays

Hylke B. J. Koers, Peter Tinyakov

备注：: 30 pages, 9 figures. (v2) Minor revision, matches version accepted for publication by JCAP
发表信息：: JCAP 0904:003,2009
DOI：: 10.1088/1475-7516/2009/04/003

摘要：

我们提出了一个简单而强大的方法来测试模型的宇宙射线（CR）的起源使用CR到达方向的分布。该方法在统计学上是明确的，在这个意义上，它是binless的，并没有调用扫描未知参数，和一般的意义上，它可以应用于任何模型，预测连续分布的CR在天空中。我们发现，它提供了一个强大的歧视各向同性分布和预测的“物质示踪剂”模型，一个基准模型，假设小CR偏转和连续分布的源跟踪宇宙中的物质分布。我们的方法是有竞争力的或优于现有的方法的统计能力，特别是在相对较少的高能量事件的情况下是敏感的。将该方法应用于目前的数据，我们发现，既不能排除各向同性分布，也不能排除物质示踪剂模型。基于其统计能力的估计，我们预计，拟议的测试将导致有意义的约束模型的CR起源的数据，将在未来几年内积累的皮埃尔俄歇天文台和望远镜阵列。

英文摘要：

We present a simple yet powerful method to test models of cosmic-ray (CR) origin using the distribution of CR arrival directions. The method is statistically unambiguous in the sense that it is binless and does not invoke scanning over unknown parameters, and general in the sense that it can be applied to any model that predicts a continuous distribution of CRs over the sky. We show that it provides a powerful discrimination between an isotropic distribution and predictions from the "matter tracer" model, a benchmark model that assumes small CR deflections and a continuous distribution of sources tracing the distribution of matter in the Universe. Our method is competitive or superior in statistical power to existing methods, and is especially sensitive in the case of relatively few high-energy events. Applying the method to the present data we find that neither an isotropic distribution nor the matter tracer model can be excluded. Based on estimates of its statistical power, we expect that the proposed test will lead to meaningful constraints on models of CR origin with the data that will be accumulated within the next few years by the Pierre Auger Observatory and the Telescope Array.

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