... ATNF Home . ... The Optical Counterparts to Galaxies in the Cen A Group Discovered by HIPASS . ... This is comparable to the values found for Local Group dwarf galaxies, which have diameters between 0.18 and 3 kpc, based on their disk scale lengths (Mateo 1998). ... The Cen A group also appears to differ from the Local Group, and other groups of galaxies, in the morphological composition of the group. ... Figure 4: A graph of M /L versus M of the known Cen A group members and the Local Group...