First-ranked galaxies in groups

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Astronomical Catalogs, Cosmology, Galactic Clusters, Galactic Evolution, Astronomical Models, Luminosity, Statistical Analysis

Scientific paper

A statistical analysis of five group catalogs shows that the B(0) magnitudes of first-ranked group members are consistent with a statistical model in which the luminosities of all group members are drawn from the same distribution. As in the Hickson compact groups, indications are that first-ranked group members are only rarely the products of distinctive evolutionary processes. Distance-dependent selection effects can introduce spurious correlations among group parameters which may appear to support environment-dependent evolution of the first-ranked group members.

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