| Issue |
A&A
Volume 428, Number 2, December III 2004
|
|
|---|---|---|
| Page(s) | 459 - 467 | |
| Section | Galactic structure, stellar clusters, and populations | |
| DOI | https://doi.org/10.1051/0004-6361:20041619 | |
| Published online | 26 November 2004 | |
Intermediate-age globular clusters in early-type galaxies: Better age determinations by adding U-band observations to the V, I, K datasets *,**
European Southern Observatory, Karl-Schwarzschild-Str. 2, 85748 Garching, Germany e-mail: [mhempel;mkissler]@eso.org
Received:
8
July
2004
Accepted:
19
August
2004
This paper represents an extension to a series of
publications on combined optical and near-infrared photometry of
globular cluster systems in early-type galaxies. Based on color-color
diagrams the cumulative age distributions of their globular cluster
systems have been derived and revealed intermediate age clusters in
two galaxies, namely NGC 4365 and NGC 5846. The extension of this
observations towards the blue wavelength range was performed in order
to increase the age resolution of photometric studies. In this paper
we present the results of U-band observations of NGC 4365 and NGC 5846
and their combination with previously obtained V, I and Ks-band
photometry. 
vs. 
color–color diagrams are used to
derive the cumulative age distribution. The later is compared to
simulated globular cluster systems of known age and size composition
in order to set constrains on relative ages and size of the
sub-populations.
Key words: galaxies: star clusters / galaxies: elliptical and lenticular, cD
© ESO, 2004
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