Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...213..323h&link_type=abstract
Astrophysical Journal, Part 1, vol. 213, Apr. 15, 1977, p. 323-326.
Astronomy and Astrophysics
Astrophysics
54
Collision Rates, Galactic Clusters, Galactic Structure, Gravitational Effects, Interacting Galaxies, Group Velocity, H Ii Regions, Interstellar Matter, Spiral Galaxies, Stellar Motions
Scientific paper
Examination of a sample of 18 dense groups of galaxies reveals that the size of the largest galaxy in each group is correlated with the mean intergalactic separation. This limitation of galaxy sizes and its dependence on the group's velocity dispersion can be roughly understood in terms of a simple theory of tidal stripping. The observed galaxy sizes are consistent with the Roche approximation for groups with low velocity dispersions and with computer simulations of fast collisions for groups with large velocity dispersions. There is a strong depletion of galaxies with H II regions and dust lanes in the groups in which collisions are expected to be most frequent. Although this trend suggests a Spitzer-Baade (1951) mechanism at work, some of the groups have more galaxies with an apparent interstellar medium than would be expected, given the collision rate. The data indicate that galaxy masses, luminosities, and morphology have been modified by collisions in these groups.
Hickson Paul
Richstone Douglas O.
Turner Edwin L.
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