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

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

Research output: Contribution to journalLetter

62 Citations (Scopus)

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 - 2007 Oct 1

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metallicity
color
photometry
ultraviolet photometry
estimates
optical filters
filter
globular clusters
filters

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

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title = "Better age estimation using ultraviolet-optical colours: Breaking the age-metallicity degeneracy",
abstract = "We demonstrate that the combination of GALEX ultraviolet (UV) photometry in the far-UV (FUV; ~1530 {\AA}) and near-UV (NUV; ~2310 {\AA}) 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.",
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Better age estimation using ultraviolet-optical colours : Breaking the age-metallicity degeneracy. / Kaviraj, S.; Rey, S. C.; Rich, R. M.; Yoon, S. J.; Yi, S. K.

In: Monthly Notices of the Royal Astronomical Society: Letters, Vol. 381, No. 1, 01.10.2007, p. L74-L78.

Research output: Contribution to journalLetter

TY - JOUR

T1 - Better age estimation using ultraviolet-optical colours

T2 - Breaking the age-metallicity degeneracy

AU - Kaviraj, S.

AU - Rey, S. C.

AU - Rich, R. M.

AU - Yoon, S. J.

AU - Yi, S. K.

PY - 2007/10/1

Y1 - 2007/10/1

N2 - 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.

AB - 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.

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U2 - 10.1111/j.1745-3933.2007.00370.x

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