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Table 1

Numbers of groups (Ngr) and galaxies (Ngal) in different group richness (Nrich) bins.

Group richness Ngr Fractiona Ngal Fractionb

All 77 858 100.0 265 578 46.1
Nrich ≥ 3 30 515 39.2 170 892 29.6
Nrich ≥ 4 16 358 21.0 128 421 22.3
Nrich ≥ 5 10 150 13.0 103 589 18.0
Nrich ≥ 6 7078 9.1 88 229 15.3
Nrich ≥ 8 4078 5.2 69 060 12.0
Nrich ≥ 10 2686 3.4 57 369 10.0
Nrich ≥ 15 1278 1.6 41 091 7.1
Nrich ≥ 20 772 1.0 32 646 5.6
Nrich ≥ 30 412 0.5 24 169 4.2
Nrich ≥ 40 233 0.3 18 145 3.1
Nrich ≥ 50 147 0.2 14 349 2.5
Nrich ≥ 75 66 0.08 9528 1.6
Nrich ≥ 100 35 0.04 6965 1.2

Nrich = 2 47 343 60.8 94 686 16.4
3 ≤ Nrich ≤ 4 20 365 26.2 67 303 11.7
5 ≤ Nrich ≤ 9 7464 9.6 46 220 8.0
10 ≤ Nrich ≤ 29 2274 2.9 33 200 5.6

Notes. 

(a)

Fraction of groups in per cent.

(b)

Fraction of galaxies in groups (per cent).

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