Luminosity Distribution of Dwarf Elliptical-like Galaxies

TL;DR

This study analyzes the structural parameters of approximately 910 dwarf elliptical-like galaxies in the local universe, revealing significant differences among sub-types and insights into their morphological features and origins.

Contribution

It provides a comprehensive analysis of dwarf elliptical-like galaxy structures and their dependence on morphological sub-types, highlighting the role of nucleation and disk features.

Findings

Significant differences in structural parameters among sub-types.

Distinct mean surface brightness for dSph galaxies.

Absence of disk features in dSph galaxies related to their origin.

Abstract

We present the structural parameters of $\sim910$ dwarf elliptical-like galaxies in the local universe ($z\lesssim0.01$) 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,dE$_{bc}$, dSph, and dE$_{blue}$). 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 ($<\mu_{e}>$) of dSph galaxies is also clearly different from that of other sub-types. The frequency of disk 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 disk feature which is thought to be closely related to their origin.