Better age estimations using UV-optical colours: breaking the age-metallicity degeneracy
Abstract
We demonstrate that the combination of GALEX UV photometry in the FUV (~1530 angstroms) and NUV (~2310 angstroms) 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 GCs in M31, and show that the full set of FUV,NUV,U,B,V,R,I photometry produces age estimates that are ~90 percent more constrained and metallicity estimates that are ~60 percent 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 spectrscopic indices.
Keywords
Cite
@article{arxiv.astro-ph/0601050,
title = {Better age estimations using UV-optical colours: breaking the age-metallicity degeneracy},
author = {S. Kaviraj and S. -C. Rey and R. M. Rich and Y. -W. Lee and S. -J. Yoon and S. K. Yi},
journal= {arXiv preprint arXiv:astro-ph/0601050},
year = {2009}
}
Comments
Published in MNRAS (2007), 381, L74 (doi: 10.1111/j.1745-3933.2007.00370.x)