Effects of different weighting procedures on the virial parameters of groups of galaxies

Whether the different hypotheses and weighting procedures on the dynamical stage of groups leads to significantly diverging results has been checked in the case of groups listed in the Turner and Gott (1976) catalog. It is found that virial parameter values are insensitive to different weighing procedures, including the cases of velocity and energy equipartition, in contradiction with some conclusions of Ozernoy and Reinhardt. In addition to the minuteness of the crossing times, and together with the lack of correlation between the fraction of elliptical plus lenticular galaxy members and the linear crossing times, this result offers additional evidence of velocity equipartition.