Study of central intensity ratio of early-type galaxies from low density environment

TL;DR

This study investigates the central intensity ratio (CIR) in early-type galaxies from low-density environments, revealing significant correlations with key galaxy and black hole properties, and proposes CIR as a useful tool for galaxy evolution studies.

Contribution

It introduces CIR as a new, efficient photometric parameter correlated with galaxy and black hole characteristics, aiding in understanding galaxy co-evolution.

Findings

CIR negatively correlates with black hole mass and velocity dispersion.

CIR correlates with galaxy luminosity and stellar bulge mass.

CIR can serve as a quick tool for galaxy evolution analysis.

Abstract

We present correlations involving central intensity ratio (CIR) of 52 early type galaxies, including 24 ellipticals and 28 lenticulars, selected from low density environment in the nearby (< 30 Mpc) universe. CIR is found to be negatively and significantly correlated with the mass of the central super massive black hole, central velocity dispersion, absolute B band magnitude, stellar bulge mass and central Mg2 index of the host galaxy. The study proposes the use of CIR as a simple, fast and efficient photometric tool for exploring the co-evolution scenario existing in galaxies.