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We present metallicity gradients in 49 local field star-forming galaxies. Wederive gas-phase oxygen abundances using two widely adopted metallicitycalibrations based on the [OIII]/Hbeta, [NII]/Halpha and [NII]/[OII] lineratios. The two derived metallicity gradients are usually in good agreementwithin +/-0.14 dex/R25 (R25 is the B-band iso-photoal radius), but themetallicity gradients can differ significantly when the ionisation parameterschange systematically with radius. We investigate the metallicity gradients asa function of stellar mass (8<log(M*/Msun)<11) and absolute B-band luminosity(-16 > MB > -22). When the metallicity gradients are expressed in dex/kpc, weshow that galaxies with lower mass and luminosity, on average, have steepermetallicity gradients. When the metallicity gradients are expressed in dex/R25,we find no correlation between the metallicity gradients, and stellar mass andluminosity. We provide a local benchmark metallicity gradient of fieldstar-forming galaxies useful for comparison with studies at high redshifts. Weinvestigate the origin of the local benchmark gradient using simple chemicalevolution models and observed gas and stellar surface density profiles innearby field spiral galaxies. Our models suggest that the local benchmarkgradient is a direct result of the coevolution of gas and stellar disk undervirtually closed-box chemical evolution when the stellar-to-gas mass ratiobecomes high (>>0.3). These models imply low current mass accretion rates(<0.3xSFR), and low mass outflow rates (<3xSFR) in local field star-forminggalaxies.

Metallicity gradients in local field star-forming galaxies: Insights on inflows, outflows, and the coevolution of gas, stars and metals