Redshifts of galaxies in the cluster Abell 262, and in the region of the Pisces group (centred on NGC 383)

Redshifts have been determined for 34 galaxies in the cluster Abell 262, and for 15 galaxies within 2^° on the sky of the Pisces group (centred on NGC 383). The mean redshift with respect to the Local Group, and corrected line-of-sight velocity dispersion for Abell 262 are 0.0167 ± 0.0003 and 411 km/s respectively based on a total of 33 redshifts. Corresponding values for galaxies in the region of the Pisces group are 0.0177 ± 0.0003 and 380 km/s based on a total of 24 redshifts. Comparison of the velocity dispersions for spiral, σ_V(S), and for elliptical and S0 galaxies, σ_V(E, S0), for five clusters (Virgo cluster, Abell 1367, Abell 262, Abell 194, and the Centaurus cluster) shows that $${\sigma}_\text{V}\text{(S)}\,\lt\,{\sigma}_\text{V}(\text{E,S0})$$ for four of these clusters. A higher velocity dispersion for spiral, as compared to elliptical and S0 galaxies, is expected if the spirals are distributed in a collapsing shell about the cluster centre.