2024/02/27 by Bronwyn Reichardt Chu, David B. Fisher, Chu, Bronwyn Reichardt +29 · 4 citations
Physics and Astronomy · #Astronomy and Astrophysical Research #Astrophysics and Star Formation Studies #Astrophysics of Galaxies (astro-ph.GA) #FOS: Physical sciences #Galaxies: Formation, Evolution, Phenomena
paper · pdf · doi:10.48550/arxiv.2402.17830
openalex publication_date 2024/02/27 · openalex created_date 2024/07/31 · openalex updated_date 2026/07/28
We measure resolved (kiloparsec-scale) outflow properties in a sample of 10 starburst galaxies from the DUVET (Deep near-UV observations of Entrained gas in Turbulent galaxies) sample, using Keck/KCWI observations of Hβ and [OIII]~λ5007. We measure ∼460 lines-of-sight that contain outflows, and use these to study scaling relationships of outflow velocity (v\rm out), mass-loading factor (η; mass outflow rate per SFR) and mass flux (Σ\rm out; mass outflow rate per area) with co-located SFR surface density (Σ\rm SFR) and stellar mass surface density (Σ∗). We find strong, positive correlations of Σ\rm out ∝ Σ\rm SFR1.2 and Σ\rm out ∝ Σ∗1.5. We also find shallow correlations between v\rm out and both Σ\rm SFR and Σ∗. Our resolved observations do not suggest a threshold in outflows with Σ\rm SFR, but rather we find that the local specific SFR (Σ\rm SFR/Σ_∗) is a better predictor of where outflows are detected. We find that outflows are very common above Σ\rm SFR/Σ_∗\gtrsim 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.