DUVET: sub-kiloparsec resolved star formation driven outflows in a sample of local starbursting disk galaxies

We measure resolved (kiloparsec-scale) outflow properties in a sample of 10 starburst galaxies from the DUVET sample, using Keck/KCWI observations of Hβ and [OIII]~λ5007. We measure ~450 lines-of-sight that contain outflows, and use these to study scaling relationships of outflow velocity (vₒᵤₜ), mass-loading factor (η; mass outflow rate per SFR) and mass flux (Σ̇ₒᵤₜ; mass outflow rate per area) with co-located SFR surface density (ΣSFR) and stellar mass surface density (Σ_). We find strong, positive correlations of Σ̇ₒᵤₜ ∝ ΣSFR1.2 and Σ̇ₒᵤₜ ∝ Σ_1.7. We also find shallow correlations between vₒᵤₜ and both ΣSFR and Σ_. Our resolved observations do not suggest a threshold in outflows with ΣSFR, but rather we find that the local specific SFR (ΣSFR/Σ_) is a better predictor of where outflows are detected. We find that outflows are very common above ΣSFR/Σ_ 0.1~Gyr⁻¹ and rare below this value. We argue that our results are consistent with a picture in which outflows are driven by supernovae, and require more significant injected energy in higher mass surface density environments to overcome local gravity. The correlations we present here provide a statistically robust, direct comparison for simulations and higher redshift results from JWST.