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Date and Time of the Query: 2019-08-17 T22:52:38 PDT
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For refcode 2004A&A...428..459H:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
2004A&A...428..459H Intermediate-age globular clusters in early-type galaxies: Better age determinations by adding U-band observations to the V, I, K datasets M. Hempel and M. Kissler-Patig 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 K_s_-band photometry. (U-I) vs. (V-K_s_) 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. Keywords: galaxies: star clusters, galaxies: elliptical and lenticular, cD
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