The Galaxy Group/Cosmology Connections
Abstract
Description
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\raise 2.0pt\hbox{$\mathchar"13C$}}} Groups of galaxies are highly linked to cosmology: 1) groups are tidally destroyed by the tidal field of the cluster they fall into; 2) spherical infall leads to the young cosmo-dynamical state of loose groups, a fundamental surface for groups, $Ω_0 \simeq 0.3$, and the mixed nature of compact groups (virialized groups, groups at full collapse, and chance alignments within collapsing loose groups, for decreasing compact group velocity dispersion) ; 3) X-ray analyses lead to $Ω_0 \lta 0.5$.
6 pages (2 figures included), uuencoded tared postscript file, to appear in XIVth Moriond Astrophysics Meeting "Clusters of Galaxies", ed. F. Durret, A. Mazure, S.D.M. White & J. Tran Thanh Van (Gif-sur-Yvette: Eds. Frontières), in press, IAP preprint 461
6 pages (2 figures included), uuencoded tared postscript file, to appear in XIVth Moriond Astrophysics Meeting "Clusters of Galaxies", ed. F. Durret, A. Mazure, S.D.M. White & J. Tran Thanh Van (Gif-sur-Yvette: Eds. Frontières), in press, IAP preprint 461