Kinematics, Structure, and Mass Outflow Rates of Extreme Starburst Galactic Outflows

Abstract We present results on the properties of extreme gas outflows in massive ( M * ∼ 10 11 ⊙ ), compact, starburst (star formation rate, SFR∼ 200 yr −1 ) galaxies at z = 0.4–0.7 with very high star surface densities (Σ SFR 2000 kpc −2 ). Using optical Keck/HIRES spectroscopy 14 HizEA galaxies, we identify maximum velocities 820–2860 km s . High-resolution allows us to measure precise column and covering fractions as a function outflow velocity characterize kinematics structure cool phase T 4 K). find substantial variation absorption profiles, which likely reflects complex morphology inhomogeneously distributed, clumpy intricacy turbulent mixing layers between cold hot phases. There is not straightforward correlation bursts galaxies’ histories their wind line might naively be expected for starburst-driven winds. The lack strong Mg ii systemic an orientation effect, where observations are down axis blowout. infer mass rates ∼50–2200 , assuming fiducial size 5 kpc, loading factors η most sample. While these values have uncertainties, they suggest that capable ejecting large amounts will substantially impact future evolution.