2pt+:一种增强的2点关联函数
The 2pt+: an enhanced 2 point correlation function
摘要:
基于两点关联函数的一种改进形式,我们提出了一种新的检验球面上点偏离各向同性的方法,我们称之为2pt+。此方法使用来自定义球体上两点之间向量的两个额外变量的信息。我们表明,这是一个强大的方法来测试偏离各向同性分布的点在一个球体上,特别是当事件的数量是小的。我们将该方法应用于天文学中的一些例子,并讨论了有限数据集的相关性,例如超高能宇宙射线的情况。
英文摘要:
We introduce a new method for testing departure from isotropy of points on a sphere based on an enhanced form of the two-point correlation function that we named 2pt+. This method uses information from the two extra variables that define the vector between two points on a sphere. We show that this is a powerful method to test departure from isotropy of a distribution of points on a sphere especially when the number of events is small. We apply the method to a few examples in astronomy and discuss the relevance for limited datasets, such as the case of ultra-high energy cosmic rays.
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