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Cluster Ages to Reconstruct the Milky Way Assembly (CARMA). II. The age-metallicity relation of Gaia-Sausage-Enceladus globular clusters

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Observational analysis shows age-metallicity relation in globular clusters from GSE merger, suggesting episodic star formation.

The study identifies a clear age-metallicity relation among globular clusters from the Gaia-Sausage-Enceladus merger.
Among 13 analyzed clusters, NGC 288 and NGC 6205 are over 2 Gyr older, indicating potential in-situ origins.
Isochrone fitting on archival Hubble Space Telescope data led to homogeneous age estimates across clusters.
Results support the hypothesis of two significant dynamical events in Milky Way history linked to cluster formation.

Agelet et al. (2025) studied this question.

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