The inflow and outflow rate evolution of local Milky Way-mass star-forming galaxies since z=1.3

Abstract

We study the gas inflow rate (${\zeta }_{\mathrm{inflow}}$) and outflow rate (${\zeta }_{\mathrm{outflow}}$) evolution of local Milky Way-mass star-forming galaxies (SFGs) since $z=1.3$. The stellar mass growth history of Milky Way-mass progenitor SFGs is inferred from the evolution of the star formation rate (SFR)$-$stellar mass ($M_{\ast }$) relation, and the gas mass ($M_{\mathrm{gas}}$) is derived using the recently established gas scaling relations. With the $M_{\ast }+M_{\mathrm{gas}}$ growth curve, the net inflow rate $\kappa$ is quantified at each cosmic epoch. At $z\sim 1.3$, $\kappa$ is comparable with the SFR, whereas it rapidly decreases to $\sim 0.15\times$SFR at $z=0$. We then constrain the average outflow rate ${\zeta }_{\mathrm{outflow}}$ of progenitor galaxies by modeling the evolution of their gas-phase metallicity. The best-fit ${\zeta }_{\mathrm{outflow}}$ is found to be $(0.5-0.8)\times$SFR. Combining $\kappa$ and ${\zeta }_{\mathrm{outflow}}$, we finally investigate the evolution of ${\zeta }_{\mathrm{inflow}}$ since $z=1.3$. We find that ${\zeta }_{\mathrm{inflow}}$ rapidly decreases by $\sim$80\% from $z=1.3$ to $z=0.5$. At $z<0.5$, ${\zeta }_{\mathrm{inflow}}$ continuously decreases but with a much lower decreasing rate. Implications of these findings on galaxy evolution are discussed.

12 pages, 9 figures, accepted by ApJ

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