Journal
ASTRONOMY & ASTROPHYSICS
Volume 401, Issue 3, Pages 851-862Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361:20021727
Keywords
cosmology : observations; cosmology : large-scale structure of the Universe
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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.
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