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Table 1
Mean difference in absolute magnitude between the BCG and the 2nd ranked galaxy and the T1 and T2 statistics (Tremaine & Richstone 1977) for our samples of BCGs.
| Compact groups | Loose groups | Equal luminosity samples | |||
| Low mass | High mass | Compact groups | Loose groups | ||
|
|
|||||
| # groups | 477 | 1414 | 1458 | 314 | 1577 |
| ⟨ ΔM12 ⟩ | 0.68 ± 0.021 | 0.53 ± 0.01 | 0.50 ± 0.01 | 0.76 ± 0.03 | 0.55 ± 0.01 |
| T 1 | 0.95 ± 0.05 | 1.08 ± 0.03 | 1.17 ± 0.03 | 0.74 ± 0.04 | 0.96 ± 0.02 |
| T 2 | 0.94 ± 0.04 | 1.02 ± 0.02 | 1.01 ± 0.02 | 0.88 ± 0.04 | 1.02 ± 0.02 |
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