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We determine the local metallicity of the ionized gas for more than$9.2\times 10^5$ star forming regions (spaxels) located in 1023 nearby galaxiesincluded in the SDSS-IV MaNGA IFU survey. We use the dust extinction derivedfrom the Balmer decrement and stellar template fitting in each spaxel toestimate the local gas and stellar mass densities, respectively. We also usethe measured rotation curves to determine the local escape velocity($\mathrm{V_{esc}}$). We have then analyze the relationships between the localmetallicity and both the local gas fraction ($\mu$) and $\mathrm{V_{esc}}$. Wefind that metallicity decreases with both increasing $\mu$ and decreasing$\mathrm{V_{esc}}$. By examining the residuals in these relations we show thatthe gas fraction plays a more primary role in the local chemical enrichmentthan $\mathrm{V_{esc}}$. We show that the gas-regulator model of chemicalevolution provides a reasonable explanation of the metallicity on local scales.The best-fit parameters for this model are consistent with metal loss caused bymomentum-driven galactic outflows. We also argue that both the gas fraction andlocal escape velocity are connected to the local stellar surface density, whichin turn is a tracer of the epoch at which the dominant local stellar populationformed

SDSS-IV MaNGA: What Shapes The Distribution Of Metals In Galaxies? Exploring The Roles Of The Local Gas Fraction And Escape Velocity