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Galactic outflows regulate the amount of gas galaxies convert into stars.However, it is difficult to measure the mass outflows remove because they spana large range of temperatures and phases. Here, we study the rest-frameultraviolet spectrum of a lensed galaxy at z~2.9 with prominent interstellarabsorption lines from O I, tracing neutral gas, up to O VI, tracingtransitional phase gas. The O VI profile mimics weak low-ionization profiles atlow velocities, and strong saturated profiles at high velocities. These trendsindicate that O VI gas is co-spatial with the low-ionization gas. Further, atvelocities blueward of -200 km/s the column density of the low-ionizationoutflow rapidly drops while the O VI column density rises, suggesting that O VIis created as the low-ionization gas is destroyed. Photoionization models donot reproduce the observed O VI, but adequately match the low-ionization gas,indicating that the phases have different formation mechanisms. Photoionizedoutflows are more massive than O VI outflows for most of the observedvelocities, although the O VI mass outflow rate exceeds the photoionizedoutflow at velocities above the galaxy's escape velocity. Therefore, most gascapable of escaping the galaxy is in a hot outflow phase. We suggest that the OVI absorption is a temporary by-product of conduction transferring mass fromthe photoionized phase to an unobserved hot wind, and discuss how thismass-loading impacts the observed circum-galactic medium.

Feeding the fire: Tracing the mass-loading of 10^7 K galactic outflows with O VI absorption