ESO Slice Project. VI. Groups of Galaxies. (Ramella+ 1999)

Details ESO Slice Project. VI. Groups of Galaxies. (Ramella+ 1999) ESO Slice Project. VI. Groups of Galaxies. (Ramella+ 1999)

Nov 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998ycat..33420001r&link_type=abstract

VizieR On-line Data Catalog: J/A+A/342/1. Originally published in: 1999A&A...342....1R

Mathematics

Logic

Clusters: Galaxy, Radial Velocities, Velocity Dispersion

Scientific paper

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 σcz (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. -- here we do not distinguish between emission and absorption line redshifts). (1 data file).

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