Are groups of galaxies virialized systems?

Details Are groups of galaxies virialized systems? Are groups of galaxies virialized systems?

Jun 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aj....105.2035d&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 105, no. 6, p. 2035-2046.

Statistics

36

Galactic Clusters, Interacting Galaxies, Astronomical Models, Galactic Evolution

Scientific paper

Groups are systems of galaxies with crossing times t(cr) much smaller than the Hubble time. Most of them have t(cr) less than 0.1/H0. The usual interpretation is that they are in virial equilibrium. We compare the data of the group catalog selected from the CfA redshift survey extension with different N-body models. We show that the distributions of kinematic and dynamical quantities of the groups in the CfA catalog can be reproduced by a single collapsing group observed along different line of sights. This result shows that (1) projection effects dominate the statistics of these systems, and (2) observed groups of galaxies are probably still in the collapse phase.

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