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Table A.2

Properties of compact groups in different subsamples: median and semi-interquartile ranges.

2MCG

Properties All Dom Non-Dom Reals CAs

Number of CGs 63 32 31
vcm [km s-1] 6535 ± 1604 7375 ± 2144 5786 ± 1499
K2K1 0.9 ± 0.4 1.4 ± 0.3 0.6 ± 0.2
K brightest 9.9 ± 0.3 10.0 ± 0.3 9.8 ± 0.3
θG [arcmin] 7.3 ± 3.2 6.2 ± 2.6 8.8 ± 3.1
Rp [kpc h-1] 64 ± 25 63 ± 26 74 ± 25
μK [mag arsec-2] 22.1 ± 0.7 22.1 ± 0.6 22.2 ± 0.8
σv [km s-1] 216 ± 118 241 ± 135 216 ± 86
Rvir [kpc h-1] 113 ± 41 113 ± 41 116 ± 39
H 0 t cr 0.033 ± 0.028 0.033 ± 0.032 0.038 ± 0.023
vir [1012h-1] 5.8 ± 6.6 7.4 ± 7.4 5.8 ± 6.6
vir/LK [ℳ/L] 38 ± 33 37 ± 47 39 ± 30

Mock CG sample

Number of CGs 150 75 75 81 69
vcm [km s-1] 6847 ± 1263 7404 ± 1335 6569 ± 1214 6774 ± 1261 7019 ± 1296
K2K1 1.3 ± 0.4 1.7 ± 0.3 0.8 ± 0.2 1.2 ± 0.4 1.3 ± 0.5
K brightest 9.8 ± 0.5 9.7 ± 0.5 9.9 ± 0.5 9.8 ± 0.4 9.8 ± 0.6
θG [arcmin] 7.3 ± 2.5 7.4 ± 2.6 6.7 ± 2.3 6.2 ± 2.1 7.8 ± 2.5
Rp [kpc h-1] 70 ± 23 75 ± 23 67 ± 24 65 ± 20 80 ± 24
μK [mag arsec-2] 22.1 ± 0.8 22.2 ± 0.9 22.0 ± 0.7 21.8 ± 0.7 22.4 ± 0.7
σv [km s-1] 254 ± 90 232 ± 92 255 ± 97 267 ± 90 229 ± 86
Rvir [kpc h-1] 101 ± 34 107 ± 33 87 ± 35 92 ± 30 126 ± 47
H 0 t cr 0.030 ± 0.017 0.034 ± 0.017 0.022 ± 0.014 0.023 ± 0.013 0.036 ± 0.022
vir [1012h-1] 6.7 ± 5.5 7.2 ± 5.3 5.0 ± 5.6 5.0 ± 4.7 7.0 ± 7.0
vir/LK [ℳ/L] 33 ± 24 37 ± 27 26 ± 23 29 ± 22 33 ± 26

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