Better age estimation using ultraviolet-optical colours: Breaking the age-metallicity degeneracy

S. Kaviraj, S.-C. Rey, S.-J. Yoon, S.K. Yi, R.M. Rich

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Abstract

We demonstrate that the combination of GALEX ultraviolet (UV) photometry in the far-UV (FUV; ~1530 Å) and near-UV (NUV; ~2310 Å) passbands with optical photometry in the standard U, B, V, R, I filters can efficiently break the age-metallicity degeneracy. We estimate well-constrained ages, metallicities and their associated errors for 42 globular clusters (GCs) in M31, and show that the full set of FUV, NUV, U, B, V, R, I photometry produces age estimates that are ~90 per cent more constrained and metallicity estimates that are ~60 per cent more constrained than those produced by using optical filters alone. The quality of the age constraints is comparable or marginally better than those achieved using a large number of spectroscopic indices.
Original languageEnglish
Pages (from-to)L74-L78
JournalMonthly Notices of the Royal Astronomical Society: Letters
Volume381
Issue number1
DOIs
Publication statusPublished - 1 Oct 2007

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