Empirical properties of nearby groups of galaxies

Virial parameters of individual groups and of synthesized groups of galaxies are determined on the basis of a new list of nearby groups of galaxies ( V 0 < 3200 km/s). Small values of the crossing time ({ T cros H 0 } ≈ 0.2) allow us to consider the groups of being gravitationally bound systems. The cumulative mass of the synthesized groups increases up to ∼1 Mpc from the center, giving the total mass‐to‐luminosity ratio f = 97 f ⊙ ( H 0 = 75 km/s/Mpc). Statistically significant correlations between virial parameters (σ v , R VT, f ) are found: f ∝ σ v 1.5 and f ∝ R VT 0.7 ; σ v and R VT are uncorrelated.