# AGN-Driven Outflows in Dwarf Galaxies

## TL;DR

This study provides the first direct evidence of AGN-driven outflows in dwarf galaxies, showing they can significantly impact gas content and star formation, thus influencing galaxy evolution models.

## Contribution

It presents the first direct detection and measurement of AGN impact on large-scale kinematics and gas in dwarf galaxies, highlighting AGN as key feedback sources.

## Key findings

- 13 out of 50 dwarf galaxies show high-velocity outflows
- Outflow velocities exceed halo escape velocities in these galaxies
- Evidence suggests AGN may suppress star formation in dwarf galaxies

## Abstract

We present spatially resolved kinematic measurements of AGN-driven outflows in dwarf galaxies in the stellar mass range $\sim6\times10^8 - 9\times10^9 M_\odot$, selected from SDSS DR7,8 and followed up with Keck/LRIS spectroscopy. We find spatially extended ($\sim 1$ half light radius), high velocity ionized gas outflows ($W_{80}$ up to $\sim2000\,\rm{km\,s}^{-1}$) in 13/50 dwarf galaxies with and without AGN. Outflow velocities in all 13 galaxies exceed the escape velocities of their halos. Nine of these 13 galaxies are classified as AGN according to their narrow line flux ratios. Of these, six have outflow components with emission line ratios consistent with AGN ionization. Although black holes have been known to populate the centers of at least a few dwarf galaxies, and indirect evidence of AGN quenching of star formation in dwarfs has begun to surface, our measurements constitute the first direct detection and measurement of AGN impact on the large scale kinematics and gas content in dwarf galaxies. Furthermore, we find evidence suggestive of ongoing star formation suppression, possibly regulated by the AGN. Galaxy formation models must therefore be able to account not only for the formation and growth of black holes at the centers of dwarf galaxies, but should also be revised to include AGN as important -- and perhaps dominant -- sources of feedback in low mass galaxies