Ages from sub-giant stars in the TOPoS sample reveal a multi-modal age-metallicity relation in the Galactic halo with peaks linked to halo, thick-disc and thin-disc components, indicating mergers were important until 8 Ga ago.
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TOPoS VII. Age-metallicity relation in the Galactic halo and assembly of the Milky Way
Ages from sub-giant stars in the TOPoS sample reveal a multi-modal age-metallicity relation in the Galactic halo with peaks linked to halo, thick-disc and thin-disc components, indicating mergers were important until 8 Ga ago.