2002/11/27 by M. Einasto, J. Einasto, V. Müller +2 · 2 citations
Mathematics · Physics and Astronomy · #Astronomy #Astrophysics #Astrophysics and Cosmic Phenomena #Astrophysics and Star Formation Studies #Cluster (spacecraft) #Galaxies: Formation, Evolution, Phenomena #Galaxy #Galaxy cluster #Galaxy groups and clusters #Geography #Gravitation #Group (periodic table) #Mathematics #Neighbourhood (mathematics) #Physics #Velocity dispersion #astro-ph
paper · pdf · doi:10.1051/0004-6361:20021727
published as Astron.Astrophys.401:851-862,2003 · 12 pages, 11 figures, 7 tables, accepted for publication in A&A
arxiv created 2002/11/27 · openalex publication_date 2003/04/01 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We have studied the properties of Las Campanas Loose Groups (Tucker et al. 2000) in the neighbourhood of rich (Abell, APM and X-ray) clusters of galaxies. These loose groups show strong evidence of segregation measured in terms of the group richness and the group velocity dispersion: loose groups in the neighbourhood of a rich cluster are typically 2.5 times more massive and 1.6 times more luminous than groups on average, and these loose groups have velocity dispersions 1.3 times larger than groups on average. This is evidence that the large-scale gravitational field causing the formation of rich clusters enhances the evolution of neighbouring poor systems, a phenomenon recently established in numerical simulations of group and cluster formation.