On actual presence of discordant-redshift galaxies in compact groups

Details On actual presence of discordant-redshift galaxies in compact groups On actual presence of discordant-redshift galaxies in compact groups

Nov 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993ap%26ss.209..181a&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 209, no. 2, p. 181-212

Astronomy and Astrophysics

Astrophysics

4

Galactic Clusters, Radial Velocity, Red Shift, Star Clusters, Statistical Analysis, Gravitational Effects, Monte Carlo Method, Phase-Space Integral, Spatial Distribution, Tables (Data)

Scientific paper

Hickson's compact galaxy groups were classified using the statistical criterion which includes the radial velocities of galaxies as well as their relative positions. These groups on the whole and their components are identified as the confident and probable non-chance ones as well as probable and confident chance ones. All confident chance objects have the discordant radial velocities with the differences of radial velocities (DV) Epsilon between 1,000 km/s and 20,000 km/s. The special class of objects 'bright discordants' is selected. These galaxies have the discordant radial velocities with DV Epsilon between 825 km/s and 8440 km/s and have a strong tendency to be the brightest components of their groups. The lowest difference of radial velocities for the last class of objects mean value of DV = (1.0 +/- 0.2) x 103 km/s and we accept this value of DV as the lowest value of discordant radial velocities. It is found that the biggest part of Hickson's compact groups consist of non-chance aggregations of galaxies and some of the cases of discordant-redshifts require a special study in order to explain their origin from a dynamic or some other point of view.

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