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Astro2020 Science White Paper: Radial Metallicity Gradients in Star-Forming Galaxies
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Spiral star-forming galaxies are complex astrophysical objects whose baryonic component 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 the distance to the galaxy center, in the so-called radial metallicity gradient. Radial metallicity gradients have been successfully used to set important constraints on galaxy formation and their chemical evolution. This paper focuses on the implications of radial metallicity gradients measured with different probes for a variety of galaxies, and on the foreseen advances in this field in the astronomical landscape of the 2020s.
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Spatial variations in the Milky Way disc metallicity-age relation
The Milky Way disc's age-metallicity relation varies with radius and height, and the youngest stars define a present-day metallicity gradient of -0.059 +/- 0.010 dex per kiloparsec.
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