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

December 2022 • 2022ApJ...941..163R

Authors • Reichardt Chu, Bronwyn • Fisher, Deanne B. • Bolatto, Alberto D. • Chisholm, John • Fielding, Drummond • Berg, Danielle • Cameron, Alex J. • Glazebrook, Karl • Herrera-Camus, Rodrigo • Kacprzak, Glenn G. • Lenkić, Laura • Li, Miao • McPherson, Daniel K. • Nielsen, Nikole M. • Obreschkow, Danail • Rickards Vaught, Ryan J. • Sandstrom, Karin

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

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Laura Lenkic