The Galaxy Group/Cosmology Connections

Details The Galaxy Group/Cosmology Connections The Galaxy Group/Cosmology Connections

1994-06-14

arxiv.org/abs/astro-ph/9406043v1

Clusters of Galaxies, pp. 291-296 (1994)

Astronomy and Astrophysics

Astrophysics

6 pages (2 figures included), uuencoded tared postscript file, to appear in XIVth Moriond Astrophysics Meeting "Clusters of Ga

Scientific paper

\def\spose#1{\hbox to 0pt{#1\hss}} \def\lta{\mathrel{\spose{\lower 3pt\hbox{$\mathchar"218$}} \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, $\Omega_0 \simeq 0.3$, 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 $\Omega_0 \lta 0.5$.

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