The relationship between the incidence of X-ray selected AGN in nearby galaxies and star-formation rate

Abstract

We present the identification and analysis of an X-ray selected AGN sample that lie within the local ($z<0.35$) galaxy population. From a parent sample of 22,079 MPA-JHU (based on SDSS DR8) galaxies, we identified 917 galaxies with central, excess X-ray emission (from 3XMM-DR7) likely originating from an AGN. We measured the host galaxies' star formation rates and classified them as either star-forming or quiescent based on their position relative to main sequence of star formation. Only 72% of the X-ray selected sample were identified as AGN using BPT selection; this technique is much less effective in quiescent hosts, only identifying 50% of the X-ray AGN. We also calculated the growth rates of the black holes powering these AGN in terms of their specific accretion rate ($\propto {\mathrm{L}}_{\mathrm{X}}/{\mathrm{M}}_{\ast }$) and found quiescent galaxies, on average, accrete at a lower rate than star-forming galaxies. Finally, we measured the sensitivity function of 3XMM so we could correct for observational bias and construct probability distributions as a function of accretion rate. AGN were found in galaxies across the full range of star formation rates (${\log }_{10}SFR/{\mathrm{M}}_{\odot }\mathrm{y}{\mathrm{r}}^{-1}=-3\mathrm{to}2$) in both star-forming and quiescent galaxies. The incidence of AGN was enhanced by a factor 2 (at a 3.5$\sigma$ significance) in star-forming galaxies compared to quiescent galaxies of equivalent stellar mass and redshift, but we also found a significant population of AGN hosted by quiescent galaxies.

14 pages, 8 figures, 2 appendices; published in MNRAS

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• Accretion properties of X-ray AGN: Evidence for radiation-regulated obscuration with redshift-dependent host galaxy contribution
• The LOFAR-eFEDS survey: The incidence of radio and X-ray AGN and the disk-jet connection
• Probing supermassive black hole growth and its dependence on stellar mass and star-formation rate in low-redshift galaxies
• Modeling Star Formation Histories of Changing-Look AGN Host Galaxies with Prospector
• The Eddington Ratio Distribution of Narrow Line Active Galactic Nuclei