Luminosity distribution of dwarf elliptical-like galaxies

Abstract

ABSTRACT We present the structural parameters of ∼910 dwarf elliptical-like galaxies in the local universe (z ≲ 0.01) derived from the r-band images of the Sloan Digital Sky Survey (SDSS). We examine the dependence of structural parameters on the morphological types (dS0, dE, dEbc, dSph, and dEblue). There is a significant difference in the structural parameters among the five sub-types if we properly treat the light excess due to nucleation in dSph and dE galaxies. The mean surface brightness within the effective radius (〈μe〉) of dSph galaxies is also clearly different from that of other sub-types. The frequency of disc features such as spiral arms depends on the morphology of dwarf galaxies. The most pronounced difference between dSph galaxies and other sub-types of early-type dwarf galaxies is the absence of disc feature which is thought to be closely related to their origin.