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Table 1.
Summary of the group samples used in this study.
| Name | Number of groups | Description |
|---|---|---|
| CG4 | 78 | Compact groups with exactly four members in a volume-limited catalog extracted from Díaz-Giménez et al. (2018) |
| Lim-Tempel | 438 408 | Intersection of the Lim et al. (2017) and Tempel et al. (2017) group catalogs |
| (573 572 galaxies) | ||
| LTz,Mr | 1950 | Lim-Tempel groups in our volume- and luminosity-limited subsample |
| (14 265 galaxies) | ||
| PC | 765 | LTz,Mr groups of at least four galaxies within three magnitudes of the brightest |
| (11 087 galaxies) | ||
| RG4 | 56 | PC groups of exactly four galaxies, excluding those whose galaxies are identical to those of a CG4 |
| Control4B | 699 | Control sample from PC with the four brightest galaxies in each group, excluding those with galaxies in common with CG4s |
| Control4C | 704 | Control sample from PC with the brightest and its three closest (in projection) galaxies, i.e. the core of the PC group, excluding those with galaxies in common with CG4s |
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