On the density of galaxy quartets and the statistical likelihood of discordant redshift groups

Details On the density of galaxy quartets and the statistical likelihood of discordant redshift groups On the density of galaxy quartets and the statistical likelihood of discordant redshift groups

Jul 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...270..417s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 270, July 15, 1983, p. 417-421.

Astronomy and Astrophysics

Astronomy

18

Galactic Clusters, Maximum Likelihood Estimates, Red Shift, Space Density, Astronomical Coordinates, Celestial Mechanics, Sky Surveys (Astronomy)

Scientific paper

The density of compact quartets of galaxies has been estimated using the Palomar Sky Survey and previously published surveys. The surface density of quartets is between 0.004 and 0.001/deg sq depending upon the selection criteria used. Previous estimates (0.010/deg sq) are shown to have been significantly in error. The quartet surface density is used to determine the likelihood that the discordant redshift groups, Stephan's Quintet, Seyfert's Sextet, and VV 172, are accidental associations. The results indicate that, on a statistical basis, these groups are not chance configurations.

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