WHAT ARE S0(0) GALAXIES?

摘要

Among early-type galaxies with almost circular isophotes, E0 and E1 galaxies are, at 99.3% significance, more luminous than face-on objects classified as S0(0) and S(0)(1). This result supports the view that rotation and "diskiness" are more important in the outer regions of faint early-type galaxies than they are for more luminous galaxies of very early morphological type.