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Table 1

Dynamical properties of the four groups.

Group Nr. of Distance Optical group centre vgroup Velocity Virial Crossing Virial Group M/L
members (Modulus) α (2000) δ (2000) dispersion radius (Rvir) time mass luminosity
within 0.5 Mpc [Mpc (mag)] [h:m:s] [°:′:′′] [km s-1] [km s-1] [Mpc] [tc H0] [1012M] [1011L] [M/L]

RR 143 5 50.8 (33.5) 06:47:22.7 –64:11:57 3404  ±  82 189  ±  66 0.49  ±  0.05 0.09  ±  0.07 6.1  ±  4.8 1.10  ±  0.005 55  ±  5
RR 210 23 31.5 (32.5) 12:06:42.8 –29:44:27 2113  ±  34 165  ±  24 0.70  ±  0.10 0.17  ±  0.21 6.5  ±  4.3 1.71  ±  0.001 38  ±  4
RR 216 12 47.9 (33.4) 12:25:56.4 –39:37:55 3206  ±  80 273  ±  58 0.71  ±  0.10 0.10  ±  0.09 18.3  ±  9.4 3.71  ±  0.009 57  ±  9
RR 242 22 50.1 (33.5) 13:20:44.1 –43:37:00 3354  ±  76 363  ±  56 0.44  ±  0.02 0.06  ±  0.02 20.3  ±  6.9 1.61  ±  0.004 125  ±  7

Notes. Numbers are based on galaxies within a radius of 0.5 Mpc from the E+S pair and a  ± 1000 km s-1 velocity interval (see Grützbauch et al. (2009) for a full description of the method).

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