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Table 1.

Substructures identified with the Serna–Gerbal dendrogram method in our group sample.

XCLASS 1330 group
ID Number Virial mass Cross. time cz
of galaxies M⊙ Years km s−1
G1 12 ≤0.1 × 1013 ≤0.1 × 109 58827
G2 3 ≤0.1 × 1013 ≤0.1 × 109 58634
G11 8 ≤0.1 × 1013 ≤0.1 × 109 58636
G12 4 ≤0.1 × 1013 ≤0.1 × 109 59162
MCG+00-27-023 group
ID Number Virial mass Cross. time cz
of galaxies M⊙ Years km s−1
G1 58 4.1 × 1013 1.3 × 109 11061
G2 4 3.9 × 1013 1.8 × 109 12485
G11 52 2.4 × 1013 1.5 × 109 10983
G12 6 0.3 × 1013 9.2 × 109 11740
G111 42 2.3 × 1013 1.4 × 109 10945
G1111 27 1.5 × 1013 1.2 × 109 10880
G11111 23 1.5 × 1013 1.1 × 109 10869
G111111 17 0.7 × 1013 1.0 × 109 10951
G111112 3 ≤0.1 × 1013 2.4 × 109 10357
G1111111 8 0.3 × 1013 1.3 × 109 11014
NGC 4065 group
ID Number Virial Mass Cross. Time cz
of galaxies M⊙ Years km s−1
G1 151 0.3 × 1013 ≤0.1 × 109 7172
G2 7 ≤0.1 × 1013 ≤0.1 × 109 13936
G11 136 ≤0.1 × 1013 ≤0.1 × 109 6983
G12 3 ≤0.1 × 1013 0.15 × 109 12541
G111 37 ≤0.1 × 1013 ≤0.1 × 109 6862
G112 3 ≤0.1 × 1013 ≤0.1 × 109 6831
G1111 13 ≤0.1 × 1013 ≤0.1 × 109 6794
G1112 6 ≤0.1 × 1013 ≤0.1 × 109 7280
NGC 4104 group
ID Number Virial mass Cross. time cz
of galaxies M⊙ Years km s−1
G1 17 1.4 × 1013 1.2 × 109 8352
G2 3 ≤0.1 × 1013 0.5 × 109 7851
G11 3 0.7 × 1013 0.5 × 109 8675
G12 2 0.5 × 1013 0.1 × 109 8525

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