VizieR Online Data Catalog: ESO Slice Project. VI. Groups of Galaxies. (Ramella+ 1999)

In Table 1 we present our group catalog. For each group we list the ID number (column 1), the number of members (column 2), the coordinates α₍₁₉₅₀₎ and δ₍₁₉₅₀₎ (columns 3 and 4 respectively), the mean radial velocity cz in km/s corrected for Virgo infall and galactic rotation (column 5), and the velocity dispersion σ_cz (column 6). We compute the velocity dispersion following the prescription of Ledermann (1984) for an unbiased estimator of the dispersion (see previous section). We also take into account the cosmological expansion of the universe and the measurement errors according to the prescriptions of Danese et al. (1980A&A....82..322D). The errors we associate to the redshifts are those output by the RVSAO cross-correlation procedure multiplied by a factor 1.6. This factor brings the cross-correlation error in rough agreement with the external error estimated from repeated observations (Vettolani et al., 1998, Cat. <J/A+AS/130/323> -- here we do not distinguish between emission and absorption line redshifts). (1 data file).