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We investigate gas inflow and outflow histories in Milky Way-like diskgalaxies, to get new insights into the baryonic processes in galaxy formationand evolution. For this purpose, we solve the equations for the evolutions ofthe surface mass densities of gas and metals at each radius in a galactic disk,based on the observed structural properties of distant star-forming galaxies,including the redshift evolution of their stellar mass distribution, theirscaling relation between the mass of baryonic components, star formation rate(SFR) and chemical abundance, as well as the supposed evolution of their radialmetallicity gradients (RMGs). We find that the efficiency of gas inflow for agiven SFR decreases with time and that the inflow rate is always nearlyproportional to the SFR. For gas outflow, although its efficiency for a givenSFR is a decreasing function of time, similarly to gas inflow, the outflow rateis not necessarily proportional to the SFR and the relation between the outflowrate and SFR strongly depends on the evolution of the adopted RMG. We also findthat the results on the outflow rate can be reproduced in the framework ofmomentum-driven (energy-driven) wind mechanism if the RMG is steepening(flattening) with time. Therefore if the well measured RMGs and their evolutionfor Milky Way-like galaxies are obtained from future observations, then ourresults will be useful to constrain the main driving mechanism for theirgalactic outflows.

Gas Inflow and Outflow Histories in Disk Galaxies as Revealed from Observations of Distant Star-Forming Galaxies