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2008MNRAS.385.1270L - Mon. Not. R. Astron. Soc., 385, 1270-1278 (2008/April-2)
Colour pairs for constraining the age and metallicity of stellar populations.
LI Z. and HAN Z.
Abstract (from CDS):
On the whole, the estimation of stellar-population parameters is likely to be reliable only for early-type galaxies with small colour errors and globular clusters, because such objects contain less dust. In fact, no galaxy is totally dust-free and early-type galaxies are also likely have some dust [e.g. E(B- V) ∼ 0.05], which can change the stellar ages by about 2.5 Gyr and metallicities (Z) by about 0.015. When we compare the photometric estimates with previous spectroscopic estimates, we find some differences, especially when comparing the stellar ages determined by two methods. The differences mainly result from the young populations of galaxies. Therefore, it is difficult to obtain the absolute values of stellar ages and metallicities, but the results are useful for obtaining some relative values.
In addition, our results suggest that colours relating to both UBVRIJHK and ugriz magnitudes are much better than either UBVRIJHK or ugriz colours for breaking the well-known degeneracy. The results also show that the stellar ages and metallicities of galaxies observed by the Sloan Digital Sky Survey and the Two-Micron All-Sky Survey can be estimated via photometry data.
Abstract Copyright: ©2008 The Authors. Journal compilation © 2008 RAS
Journal keyword(s): galaxies: elliptical and lenticular, cD - galaxies: photometry - galaxies: stellar content
VizieR on-line data: <Available at CDS (J/MNRAS/385/1270): metage.dat>
Simbad objects: 9
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