Dwarf Galaxies in the Core of Coma Cluster

TL;DR

This study analyzes the structural properties and morphology of 221 galaxies in the Coma Cluster core, revealing the distribution of galaxy types and the effectiveness of different fitting models for dwarfs and giants.

Contribution

It provides a detailed correlation between galaxy morphology, structural parameters, and fitting models specifically for galaxies in the Coma Cluster core.

Findings

Dwarfs constitute 18% of the core galaxy population.

Single Sersic fits are optimal for dwarfs and spiral galaxies.

Multiple component fits are better for giant galaxies.

Abstract

Dwarf galaxies constitute 18\% of the galaxies in the core of the Coma Cluster. We present the correlation between structural properties and morphology of galaxies in the central region of Coma Cluster for 221 objects within the apparent magnitude range m $<$ 19.5. The data is taken from the HST/ACS Coma Cluster Treasury Survey. For cluster membership we have used photometric redshifts and spectroscopic redshifts from literature. From the investigation of correlations of effective radius, Sersic index, absolute magnitude and bulge to total light ratio, we find the galaxies are distributed as follows: dwarfs 18\%, E/SO 33\%, SO 22\%, Sb \& Sb0 17\% and 10\% are Spirals+Irregulars+Ring. We found that multiple component fits are best for giants and the single Sersic fit is best for dwarfs \& spiral galaxies. We shall try to explain why the single Sersic fit is best for dwarfs and what kind of stellar orbits do they correspond to using the bulge Sersic index of dwarfs .