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 (Σ˙out; mass outflow rate per area) with
co-located SFR surface density (ΣSFR) and stellar mass surface
density (Σ∗). We find strong, positive correlations of
Σ˙out∝ΣSFR1.2 and Σ˙out∝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.Comment: 14 pages, 7 figures, plus 4 figures in appendix, submitted to MNRA