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Fig. 6.

image

Schematic representations of the [Fe/H]-[α/Fe], age-metallicity, and age-[α/Fe] relations according to the analysis presented in Sects. 3 and 4. In all the plots, the thick curve represents the evolution of the inner disk, which is described by a closed-box model (Haywood et al. 2018) with a two-phase SFH separated by a quenching episode (thinner segment along this thick curve). We expect the evolution of the inner disk to have a tight, well-defined age-metallicity relation (see Haywood et al. 2018). At a given epoch, the inner disk, R ≲ 6 kpc, is always the point of maximum metallicity reached by the Milky Way. The thinner, colored tracks describe the evolution of the outer disk at different radii and the initial dilution increasing with R. While the dilution seems to have occurred after the quenching phase at the solar radius, it may have been at earlier times in the outer disk.

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