Star formation characteristics of galaxies hosting AGN

TL;DR

This study analyzes UV observations of two Seyfert AGN host galaxies, identifying star-forming regions and estimating their star formation rates to understand the relationship between AGN activity and star formation.

Contribution

It provides new UV-based measurements of star formation rates in the host galaxies of NGC 4051 and NGC 4151, highlighting differences in their star-forming activity.

Findings

NGC 4051 has a median SFR of 3.16 x 10^-5 M_sun/yr

NGC 4151 has a median SFR of 0.012 M_sun/yr

Star formation rates vary significantly between the two galaxies

Abstract

We present an analysis of the ultra-violet (UV) observations of two Seyfert type active galactic nuclei (AGN), namely NGC$~$4051 and NGC$~$4151. These observations aimed at studying the star formation in the hosts of these AGN were carried out with the ultra-violet imaging telescope on board AstroSat in far-UV. A total of 193 and 328 star-forming regions (SF) were identified using SExtractor in NGC$~$4051 and NGC$~$4151, respectively. Using aperture photometry of the identified SF regions, we estimated the star formation rates (SFRs). We found NGC$~$4051 to have the lowest SFR with a median value of 3.16 $\times$ 10$^{-5}$ M$_{\odot}$ yr$^{-1}$ while for NGC$~$4151, we found a median SFR of 0.012 M$_{\odot}$ yr$^{-1}$.