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We use the hydrodynamical EAGLE simulation to test if ultra-compact dwarfgalaxies (UCDs) can form by tidal stripping by predicting the ages andmetallicities of tidally stripped galaxy nuclei in massive galaxy clusters, andcompare these results to compiled observations of age and metallicities ofobserved UCDs. We further calculate the colours of our sample of simulatedstripped nuclei using SSP models and compare these colours to observations ofUCDs in the Virgo cluster. We find that the ages of observed UCDs areconsistent with simulated stripped nuclei, with both groups of objects having amean age > 9 Gyr. Both stripped nuclei and UCDs follow a similarmass-metallicity relationship, and the metallicities of observed UCDs areconsistent with those of simulated stripped nuclei for objects with M >$10^{7}~M_{\odot}$. The colours of observed UCDs are also consistent with oursimulated stripped nuclei, for objects with M > $10^{7}~M_{\odot}$, with moremassive objects being redder. We find that the colours of stripped nucleiexhibit a bimodal red and blue distribution that can be explained by thedependency of colour on age and metallicity, and by the mass-colour relation.We additionally find that our low mass stripped nuclei sample is consistentwith the colour of blue globular clusters. We conclude that the internalproperties of simulated nuclei support the tidal stripping model of UCDformation.

Testing the tidal stripping scenario of ultra-compact dwarf galaxy formation by using internal properties