Las Campanas Loose Groups in the Supercluster-Void Network

Details Las Campanas Loose Groups in the Supercluster-Void Network Las Campanas Loose Groups in the Supercluster-Void Network

2003-05-14

arxiv.org/abs/astro-ph/0305241v1

Astron.Astrophys. 405 (2003) 821-832

Astronomy and Astrophysics

Astrophysics

12 pages, 8 figures, 2 tables, accepted for publication in A&A

Scientific paper

10.1051/0004-6361:20030632

We study the spatial distribution of loose groups from the Las Campanas Redshift Survey, comparing it with the supercluster-void network delineated by rich clusters of galaxies. We use density fields and the friends-of-friends algorithm to identify the members of superclusters of Abell clusters among the Las Campanas loose groups. We find that systems of loose groups tend to be oriented perpendicularly to the line-of-sight, and discuss possible reasons for that. We show that loose groups in richer systems (superclusters of Abell clusters) are themselves also richer and more massive than groups in systems without Abell clusters. Our results indicate that superclusters, as high density environments, have a major role in the formation and evolution of galaxy systems.

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