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Spiral star-forming galaxies are complex astrophysical objects whose baryoniccomponent is dominated by the disk, where most of the star formation resides.The metallicity in the disk is not uniform, and it usually decreases with thedistance to the galaxy center, in the so-called radial metallicity gradient.Radial metallicity gradients have been successfully used to set importantconstraints on galaxy formation and their chemical evolution. This paperfocuses on the implications of radial metallicity gradients measured withdifferent probes for a variety of galaxies, and on the foreseen advances inthis field in the astronomical landscape of the 2020s.

Astro2020 Science White Paper: Radial Metallicity Gradients in Star-Forming Galaxies