Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-01-15
Astrophys.Space Sci.324:347-350,2009
Astronomy and Astrophysics
Astrophysics
5 pages, 2 figures, to appear in Young Massive Star Clusters, eds. E. Perez, R. de Grijs, R. Gonzalez Delgado
Scientific paper
10.1007/s10509-009-0093-8
Globular Cluster Systems (GCSs) of most early-type galaxies feature two peaks in their optical colour distributions. Blue-peak GCs are believed to be old and metal-poor, whereas the ages, metallicities, and the origin of the red-peak GCs are still being debated. We obtained deep K-band photometry and combined it with HST observations in g and z to yield a full SED from optical to near-infrared. This now allows us to break the age-metallicity degeneracy. We used our evolutionary synthesis models GALEV for star clusters to compute a large grid of models with different metallicities and a wide range of ages. Comparing these models to our observations revealed a large population of intermediate-age (1-3 Gyr) and metalrich (~ solar metallicity) globular clusters, that will give us further insights into the formation history of this galaxy.
Anders Peter
Fritze Uta
Kotulla Ralf
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