Fig. 15.

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Left column: Evolution of mono-Rbirth populations in the age–metallicity relation for a TNG50 Milky Way and Andromeda-like galaxy (subhalo 402555) whose mono-Rbirth populations exhibit “wiggling” behavior, where each mono-Rbirth population did not experience a monotonic enrichment in [Fe/H]. Right column: [Fe/H] abundance of mono-Rbirth populations relative to [Fe/H](R < 2 kpc) across age. Looking at the [Fe/H] abundance relative to the inner few kpc at a given age allows the structure of the wiggles to become more clear. Most of the galaxies that exhibit “wiggling” structure in this plane follow similar trends to this galaxy – each Rbirth sees a depletion in [Fe/H] at the same time as also seen using Rbirth methods (see Fig. 2 in Ratcliffe et al. 2023).
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