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We examine gas accretion and subsequent star formation in representativegalaxies from the McMaster Unbiased Galaxy Simulations (Stinson et al. 2010).Accreted gas is bimodal with a natural temperature division at $10^5$ K, nearthe peak of the cooling curve. Cold-mode accretion dominates inflows at earlytimes, creating a peak in total accretion at redshift z=2-4 and decliningexponentially below z$\sim$2. Hot-mode accretion peaks near z=1-2 and declinesgradually. Hot-mode exceeds cold-mode accretion at z$\sim$1.8 for all fourgalaxies rather than when the galaxy reaches a characteristic mass. Cold-modeaccretion can fuel immediate star formation, while hot-mode accretionpreferentially builds a large, hot gas reservoir in the halo. Late-time starformation relies on reservoir gas accreted 2-8 Gyr prior. Thus, the reservoirallows the star formation rate to surpass the current overall gas accretionrate. Stellar feedback cycles gas from the interstellar medium back into thehot reservoir. Stronger feedback results in more gas cycling, gas removal in agalactic outflow and less star formation overall, enabling simulations to matchthe observed star formation history. For lower mass galaxies in particular,strong feedback can delay the star formation peak to z=1-2 from the accretionpeak at z=2-4.

The Role of Cold Flows and Reservoirs in Galaxy Formation With Strong Feedback