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 language | English |
|---|---|
| Pages (from-to) | L74-L78 |
| Journal | Monthly Notices of the Royal Astronomical Society: Letters |
| Volume | 381 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 2007 Oct 1 |
Fingerprint
All Science Journal Classification (ASJC) codes
- Astronomy and Astrophysics
- Space and Planetary Science
Cite this
}
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 journal › Letter
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.
UR - http://www.scopus.com/inward/record.url?scp=36549035557&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=36549035557&partnerID=8YFLogxK
U2 - 10.1111/j.1745-3933.2007.00370.x
DO - 10.1111/j.1745-3933.2007.00370.x
M3 - Letter
AN - SCOPUS:36549035557
VL - 381
SP - L74-L78
JO - Monthly Notices of the Royal Astronomical Society: Letters
JF - Monthly Notices of the Royal Astronomical Society: Letters
SN - 1745-3925
IS - 1
ER -