Peeking beneath the precision floor -- II. Probing the chemo-dynamical histories of the potential globular cluster siblings, NGC 288 and NGC 362

Understand

The assembly history of the Milky Way (MW) is a rapidly evolving subject, with numerous small accretion events and at least one major merger proposed in the MW's history.

• Accreted alongside these dwarf galaxies are globular clusters (GCs), which act as spatially coherent remnants of these past events.
• Using high precision differential abundance measurements from our recently published study, we investigate the likelihood that the MW clusters NGC 362 and NGC 288 are galactic siblings, accreted as part of the Gaia-Sausage-Enceladus (GSE) merger.
• To do this, we compare the two GCs at the 0.01 dex level for 20+ elements for the first time.