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

The study of the properties of galaxy clusters and their environment gives the authors information about the formation and evolution of galaxies, groups and clusters, and larger structures -- superclusters of galaxies and the whole cosmic Web. They study the relations between the multimodality of ga...

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Bibliographic Details
Published in:Astronomy and astrophysics (Berlin) 2012-06, Vol.542, p.1-1
Main Authors: Einasto, M, Liivamaegi, L J, Tempel, E, Saar, E, Vennik, J, Nurmi, P, Gramann, M, Einasto, J, Tago, E, Heinaemaeki, P, Ahvensalmi, A, Martinez, V J
Format: Article
Language:English
Subjects:
Astronomy
Clusters
Density
Filaments
Morphology
Spiders
Substructures
Three dimensional models
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Summary:The study of the properties of galaxy clusters and their environment gives the authors information about the formation and evolution of galaxies, groups and clusters, and larger structures -- superclusters of galaxies and the whole cosmic Web. They study the relations between the multimodality of galaxy clusters drawn from the SDSS DR8 and the environment where they reside. They use 3D normal mixture modelling, the Dressler-Shectman test, and the peculiar velocity of cluster main galaxies as signatures of multimodality of clusters. 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 authors' study shows the importance of the role of superclusters as high density environment, which affects the properties of galaxy systems in them.
ISSN:0004-6361
1432-0746