SIMBAD references

A ``friends-of-friends'' percolation algorithm has been used to extract a catalog of δn/n=80 density enhancements (groups) from the six slices of the Las Campanas Redshift Survey (LCRS). The full catalog contains 1495 groups and includes 35% of the LCRS galaxy sample. A clean sample of 394 groups has been derived by culling groups from the full sample that either are too close to a slice edge, have a crossing time greater than a Hubble time, have a corrected velocity dispersion of zero, or contain a 55" ``orphan'' (a galaxy with a mock redshift that was excluded from the original LCRS redshift catalog due to its proximity to another galaxy–i.e., within 55"). Median properties derived from the clean sample include a line-of-sight velocity dispersion σ_los=164 km.s^–1, crossing time t_cr=0.10 H^–1₀, harmonic radius R_h=0.58 h^–1 Mpc, pairwise separation R_p=0.64 h^–1 Mpc, virial mass M_vir=1.90x10¹³ h^–1 M_☉, total group R-band luminosity L_tot=1.30x10¹¹ h^–2 L_☉, and R-band mass-to-light ratio M/L=171 h M_☉/L_☉; the median number of observed members in a group is three.