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With the installation of the Cosmic Origins Spectrograph on the Hubble SpaceTelescope, measurements of the metal content of the low redshift intergalacticmedium (IGM) are now available. Using a new grid-based model for diffuse gascoupled to the SAGE semi-analytic model of galaxy formation, we examine theimpact of supernova feedback on the pollution of the IGM. We consider differentassumptions for the reheating and ejection of gas by supernovae and theirdependence on galaxy circular velocity and gas surface density. Where metalsare present, we find the most likely metallicity to be $-1.5 <$log$_{10}$(Z/Z$_{\odot}$)$< -1.0$ at $z = 0$, consistent with bothobservations and more sophisticated hydrodynamic simulations. Our modelpredicts that the regions of the IGM with the highest metallicities will benear galaxies with M$_{\star} \sim 10^{10.5}h^{-1}$M$_{\odot}$ and inenvironments of densities $\sim 10 \times$ the mean. We also find that 90% ofIGM metals at $z = 0$ are ejected by galaxies with stellar masses less than$10^{10.33}h^{-1}$M$_{\odot}$.

Thinking outside the halo: Tracing the large-scale distribution of diffuse cosmic metals with semi-analytic models