"Gas inflow and outflow are key processes that control star formation history of galaxies. In order to understand the growth of galaxies, it is crucial to quantify the gas flows and investigate the dependence on physical properties of galaxies. Here, we take an approach based on chemical evolution, since histories of star formation and gas flows are imprinted on the gas-phase metallicity.
By comparing observational data with predictions by chemical evolution models, we attempt to extract information about gas inflow and outflow of star forming main-sequence galaxies at redshift 1.4. In this talk, we would like to discuss our recent results."