银河系，朋友和熟人：测试星系协会方法
Siblings, friends and acquaintances: Testing galaxy association methods
摘要：
为了限制星系巡天中关联方法的局限性，我们分析了宇宙学模拟的$z=0$上的晕目录，试图重现观测巡天所处理的局限性。我们重点介绍了渗滤法，通常称之为友友法，在文学作品中常用。对Multidark项目的暗物质宇宙学模拟MDPL 2进行了分析。结果表明，在高密度环境中，大量的污染物晕。关联参数中的保留和随后的观测特性分析可以减少假阳性的发生。在特殊情况下，对子结构进行测试也是有效的。
英文摘要：
In order to constraint the limitations of association methods applied to galaxy surveys, we analysed the catalogue of halos at $z=0$ of a cosmological simulation, trying to reproduce the limitations that an observational survey deal with. We focused in the percolation method, usually called Friends of Friends method, commonly used in literature. The analysis was carried on the dark matter cosmological simulation MDPL2, from the Multidark project. Results point to a large fraction of contaminants for massive halos in high density environments. Thresholds in the association parameters and the subsequent analysis of observational properties can mitigate the occurrence of fake positives. The use of tests for substructures can also be efficient in particular cases.
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