On the Anticorrelation Between Galaxy Light Concentration and X-ray-to-Optical Flux Ratio

TL;DR

This study uncovers a novel anticorrelation between galaxy light concentration and X-ray-to-optical flux ratio in AGNs, suggesting different accretion behaviors in early and late type galaxies, with implications for galaxy evolution.

Contribution

First to identify an anticorrelation between galaxy light concentration and X-ray-to-optical flux ratio in AGNs, linking galaxy morphology to accretion activity.

Findings

Discovered an anticorrelation between X/O and galaxy concentration C.

Early type galaxies tend to have lower Eddington rates.

Late type galaxies show higher accretion activity.

Abstract

Active Galactic Nuclei (AGN) play an important role in many aspects of the modern cosmology, and of particular interest is the issue of the interplay between AGN and their host galaxy. Using X-ray and optical data sets, we have explored the properties of a large sample of AGNs in the Subaru/XMM-Newton Deep Survey (SXDS) field, and studied their evolution in relation with the evolution of their host galaxy. We present here an anticorrelation between X-ray-to-optical flux ratio (X/O) and galaxy light concentration (C), which has been found for the first time and might suggest that early type galaxies, having poor matter supply to feed the AGN activity, have lower Eddington rates than those of late type galaxies.