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We applied a membership test based on the color similarity of group membersto detect the discordant galaxies in small groups (quintets) that had beendetermined by the Friends-of-Friends (FoF) algorithm. Our method depends on thesimilarity of the color indices (u-g) and (g-r) of the group members. Thechosen sample of quintets was extracted from "Flux- and volume-limited groupsfor SDSS galaxies" catalog which is a spectroscopic sample of galaxiesoriginally taken from the Sloan Digital Sky Survey - Data Release 10(SDSS-DR10). The sample included 282 quintets with a total number of 1410galaxies. The similarity measure used in this study is the Euclidean distance.The calculations showed that 73.4% of the group samples (207 out of 282 quintetgroups) have galaxies with similar colors (u-g) and (g-r). Each of theremainder groups (75 systems) has an interloper galaxy with different colorsthan the other members, and hence they became quadrants. We found that groupmembers tend to be more luminous than outliers. We conclude that using thesimilarities in the color indices between group members gives betteridentification of group membership.

Color similarity study among small galaxy groups members