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arXiv 0905.3481astro-ph.CO
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探索Cl 0024+17周围的聚类特征

Probing clustering features around Cl 0024+17

A. L. B. Ribeiro

摘要:

我提出了一个空间分析的星系团Cl 0024+17周围的分布。的基本目的是找到星系的尺度呈现出显着的偏差,从一个非均匀的泊松统计过程。利用Ripley、Besag和非平稳点模式的成对关联函数的推广,我估计了Cl 0024+17场的一组1,000个Monte Carlo实现的这些跃迁尺度,并对其进行了完整性校正。结果指出,在31.4和112.9角秒的这个领域中至少有两个物理尺度的存在。第二个与Jee等人(2007)先前确定的暗物质环半径(约75角秒)在统计学上一致。然而,形态学和各向异性测试指出,在约120弧秒的集群西北从集群中心可能是负责第二过渡规模。这些结果并不表明存在一个星系对应的暗物质环,但开发的方法来研究星系场作为一个空间点模式提供了一个很好的统计评估的物理尺度周围的集群。我简要地讨论了这种方法探测星系分布和N体暗物质模拟数据的功能的实用性。

英文摘要:

I present a spatial analysis of the galaxy distribution around the cluster Cl 0024+17. The basic aim is to find the scales where galaxies present a significant deviation from an inhomogeneous Poisson statistical process. Using the generalization of the Ripley, Besag, and the pair correlation functions for non-stationary point patterns, I estimate these transition scales for a set of 1,000 Monte Carlo realizations of the Cl 0024+17 field, corrected for completeness up to the outskirts. The results point out the presence of at least two physical scales in this field at 31.4 and 112.9 arcseconds. The second one is statistically consistent with the dark matter ring radius (about 75 arcseconds) previously identified by Jee et al. (2007). However, morphology and anisotropy tests point out that a clump at about 120 arcseconds NW from the cluster center could be the responsible for the second transition scale. These results do not indicate the existence of a galaxy counterpart of the dark matter ring, but the methodology developed to study the galaxy field as a spatial point pattern provides a good statistical evaluation of the physical scales around the cluster. I briefly discuss the usefulness of this approach to probe features in galaxy distribution and N-body dark matter simulation data.

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