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Dynamical properties of compact groups of galaxies
Hickson, Paul; Mendes de Oliveira, Claudia; Huchra, John P.; Palumbo, Giorgio G.
AA(British Columbia Univ., Vancouver, Canada), AB(British Columbia Univ., Vancouver, Canada), AC(Harvard-Smithsonian Center for Astrophysics, Cambridge, MA), AD(Bologna Univ., Italy)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 399, no. 2, p. 353-367. (ApJ Homepage)
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NASA/STI Keywords:
Compact Galaxies, Mass To Light Ratios, Radial Velocity, Velocity Distribution, Interstellar Matter, Luminosity, Red Shift
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Radial velocities are presented for 457 galaxies in the 100 Hickson compact groups. More than 84 percent of the galaxies measured have velocities within 1000 km/s of the median velocity in the group. Ninety-two groups have at least three accordant members, and 69 groups have at least four. The radial velocities of these groups range from 1380 to 42,731 km/s with a median of 8889 km/s, corresponding to a median distance of 89/h Mpc. The apparent space density of these systems ranges from 300 to as much as 10 exp 8 sq h/sq Mpc, which exceeds the densities in the centers of rich clusters. The median projected separation between galaxies is 39/h kpc, comparable to the sizes of the galaxies themselves. A significant correlation is found between crossing time and the fraction of gas-rich galaxies in the groups, and a weak anticorrelation is found between crossing time and the luminosity contrast of the first-ranked galaxy.

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