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We examine the effects of SMBH feedback on the CGM using a cosmologicalhydrodynamic simulation \citep[{\sc Romulus25};][]{Tremmel2017} and a set offour zoom-in `genetically modified' Milky Way-mass galaxies sampling differentevolutionary paths. By tracing the distribution of metals in the circumgalacticmedium (CGM), we show that \ion{O}{6} is a sensitive indicator of supermassiveblack hole (SMBH) feedback. First, we calculate the column densities of\ion{O}{6} in simulated Milky Way-mass galaxies and compare them withobservations from the COS-Halos Survey. Our simulations show column densitiesof \ion{O}{6} in the CGM consistent with those of COS-Halos star forming andquenched galaxies. These results contrast with those from previous simulationstudies which typically underproduce CGM column densities of \ion{O}{6}. Wedetermine that a galaxy's star formation history and assembly record havelittle effect on the amount of \ion{O}{6} in its CGM. Instead, column densitiesof \ion{O}{6} are closely tied to galaxy halo mass and BH growth history. Theset of zoom-in, genetically modified Milky Way-mass galaxies indicates that theSMBH drives highly metal-enriched material out into its host galaxy's halowhich in turn elevates the column densities of \ion{O}{6} in the CGM.

Not So Heavy Metals: Black Hole Feedback Enriches The Circumgalactic Medium