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The ages and metallicities of globular clusters play an important role notjust in testing models for their formation and evolution but in understandingthe assembly history for their host galaxies. Here we use a combination ofimaging and spectroscopy to measure the ages and metallicities of globularclusters in M31, the closest massive galaxy to our own. We use the strength ofthe near-infrared calcium triplet spectral feature to provide a relatively ageinsensitive prior on the metallicity when fitting stellar population models tothe observed photometry. While the age-extinction degeneracy is an issue forglobular clusters projected onto the disc of M31, we find generally old agesfor globular clusters in the halo of M31 and in its satellite galaxy NGC 205 inline with previous studies. We measure ages for a number of outer halo globularclusters for the first time, finding that globular clusters associated withhalo substructure extend to younger ages and higher metallicities than thoseassociated with the smooth halo. This is in line with the expectation that thesmooth halo was accreted earlier than the substructured halo.

Measuring M31 globular cluster ages and metallicities using both photometry and spectroscopy