DUVET: Spatially Resolved Observations of Star Formation Regulation via Galactic Outflows in a Starbursting Disk Galaxy

Abstract

We compare 500~pc scale, resolved observations of ionised and molecular gas for the $z\sim 0.02$ starbursting disk galaxy IRAS08339+6517, using measurements from KCWI and NOEMA. We explore the relationship of the star formation driven ionised gas outflows with colocated galaxy properties. We find a roughly linear relationship between the outflow mass flux (${\dot{\Sigma }}_{\mathrm{out}}$) and star formation rate surface density (${\Sigma }_{\mathrm{SFR}}$), ${\dot{\Sigma }}_{\mathrm{out}}\propto {\Sigma }_{\mathrm{SFR}}^{1.06\pm 0.10}$, and a strong correlation between ${\dot{\Sigma }}_{\mathrm{out}}$ and the gas depletion time, such that ${\dot{\Sigma }}_{\mathrm{out}}\propto t_{dep}^{-1.1\pm 0.06}$. Moreover, we find these outflows are so-called ``breakout" outflows, according to the relationship between the gas fraction and disk kinematics. Assuming that ionised outflow mass scales with total outflow mass, our observations suggest that the regions of highest ${\Sigma }_{\mathrm{SFR}}$ in IRAS08 are removing more gas via the outflow than through the conversion of gas into stars. Our results are consistent with a picture in which the outflow limits the ability for a region of a disk to maintain short depletion times. Our results underline the need for resolved observations of outflows in more galaxies.

16 pages, 7 figures, Submitted to ApJ

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