# This is not the feedback you have been looking for: nearby optical AGN rarely drive kpc-scale cold-gas outflows

## TL;DR

This study finds that nearby Seyfert 2 galaxies rarely drive large-scale cold-gas outflows, suggesting optical AGN activity is not a major factor in quenching star formation compared to star formation itself.

## Contribution

It provides a large-scale statistical analysis showing optical AGN activity has minimal impact on driving kpc-scale outflows in nearby galaxies, challenging previous assumptions.

## Key findings

- Galactic-scale outflows are rare in Seyfert 2 galaxies.
- No significant difference in outflow rates between Seyferts and control galaxies.
- Star formation likely dominates the driving of cold-gas outflows.

## Abstract

We study the interstellar Na I $\lambda \lambda 5890, 5895$ (Na D) absorption-line doublet in a nearly-complete sample of $\sim$9900 nearby Seyfert 2 galaxies, in order to quantify the significance of optical AGN activity in driving kpc-scale outflows that can quench star formation. Comparison to a carefully matched sample of $\sim$44,000 control objects indicates that the Seyfert and control population have similar Na D detection rates ($\sim 5-6%$). Only 53 Seyferts (or 0.5% of the population) are found to potentially display galactic-scale winds, compared to 0.8% of the control galaxies. While nearly a third of the Na D outflows observed in our Seyfert 2 galaxies occur around the brightest AGN, both radio and infrared data indicate that star formation could play the dominant role in driving cold-gas outflows in an even higher fraction of the Na D-outflowing Seyfert 2s. Our results indicate that galactic-scale outflows at low redshift are no more frequent in Seyferts than they are in their non-active counterparts, that optical AGN are not significant contributors to the quenching of star formation in the nearby Universe, and that star-formation may actually be the principal driver of outflows even in systems that do host an AGN.