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- W2155996019 abstract "Context. The combination of optical and near-infrared (NIR) colours has the potential to break the age/metallicity degeneracy and offers a better metallicity sensitivity than optical colours alone. Previous tudies of extragalactic globular clusters (GCs) with this colour combination, however, have suffered from small samples or have been restricted to a few galaxies. Aims. We compile a homogeneous and representative sample of GC systems with multi-band photometry to be used in subsequent papers where ages and metallicity distributions will be studied. Methods. We acquired deep K-band images of 14 bright nearby early-type galaxies. The images were obtained with the LIRIS nearinfrared spectrograph and imager at the William Herschel Telescope (WHT) and combined with optical ACS g and z images from the Hubble Space Telescope public archive. Results. For the first time we present homogeneous GC photometry in this wavelength regime for a large sample of galaxies, 14. We achieved a limitingmagnitude of K ∼ 20−21. For the majority of the galaxies we detect about 70 GCseach. NGC4486 and NGC4649, the cluster-richest galaxies in the sample contain 301 and 167 GCs, respectively. We present tables containing coordinates, photometry and sizes of the GCs." @default.
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- W2155996019 date "2011-01-01" @default.
- W2155996019 modified "2023-09-23" @default.
- W2155996019 title "An optical/NIR survey of globular clusters in early-type galaxies I. Introduction and data reduction procedures" @default.
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