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arXiv 1204.0933astro-ph.CO
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超团簇空洞网络中SDSS DR8富团簇的多峰性

Multimodality of rich clusters from the SDSS DR8 within the supercluster-void network

M. Einasto, L. J. Liivamagi, E. Tempel, E. Saar, J. Vennik, P. Nurmi, M. Gramann, J. Einasto, E. Tago, P. Heinamaki, A. Ahvensalmi, V. J. Martinez

摘要:

我们研究了SDSS DR 8中的星系团的多峰性与它们所处环境的关系。作为集群环境,我们考虑的全球光度密度场,超星系团成员,超星系团形态。我们使用3D正常的混合模型,Dressler-Shectman测试,和集群的主星系的特有的速度作为集群的多模态的签名。我们通过计算光度密度场来研究星系团周围的环境密度,寻找星系团所在的超星系团。我们用Minkowski泛函确定了超团簇的形态,并比较了不同形态超团簇中团簇的性质。本文应用主成分分析法研究了团簇的多峰参数与环境的关系。我们发现,多模态集群居住在更高的密度环境比单峰集群。超团簇中的团簇比孤立的团簇有更高的概率具有子结构。超星系团可以分为两种主要的形态类型,蜘蛛和细丝。蜘蛛状超星系团中的星系团比丝状超星系团中的星系团具有更高的主星系亚结构和更大的特有速度的概率。最明亮的星系团位于高密度的富超星系团核心。七个最明亮的星团中有五个和七个最多峰的星团中有五个位于蜘蛛型超星团中;七个最单峰的星团中有四个位于顺从型超星团中。我们的研究表明,超星系团作为高密度环境的作用的重要性,影响星系系统的性质在其中。

英文摘要:

We study the relations between the multimodality of galaxy clusters drawn from the SDSS DR8 and the environment where they reside. As cluster environment we consider the global luminosity density field, supercluster membership, and supercluster morphology. We use 3D normal mixture modelling, the Dressler-Shectman test, and the peculiar velocity of cluster main galaxies as signatures of multimodality of clusters. We calculate the luminosity density field to study the environmental densities around clusters, and to find superclusters where clusters reside. We determine the morphology of superclusters with the Minkowski functionals and compare the properties of clusters in superclusters of different morphology. We apply principal component analysis to study the relations between the multimodality parametres of clusters and their environment simultaneously. We find that multimodal clusters reside in higher density environment than unimodal clusters. Clusters in superclusters have higher probability to have substructure than isolated clusters. The superclusters can be divided into two main morphological types, spiders and filaments. Clusters in superclusters of spider morphology have higher probabilities to have substructure and larger peculiar velocities of their main galaxies than clusters in superclusters of filament morphology. The most luminous clusters are located in the high-density cores of rich superclusters. Five of seven most luminous clusters, and five of seven most multimodal clusters reside in spider-type superclusters; four of seven most unimodal clusters reside in filament-type superclusters. Our study shows the importance of the role of superclusters as high density environment which affects the properties of galaxy systems in them.

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