AGN-Driven Outflows in Dwarf Galaxies

Abstract

We present spatially resolved kinematic measurements of AGN-driven outflows in dwarf galaxies in the stellar mass range $\sim 6\times 10^8-9\times 10^9{M}_{\odot }$, 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 $\sim 2000{\mathrm{km}\mathrm{s}}^{-1}$) 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

arXiv comment18 pages, 11 figures, 1 table, submitted May 21, 2019; Accepted September 1, 2019

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