NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-08-22 T19:23:37 PDT
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For refcode 2003A&A...405..487H:
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NED Abstract

Copyright by European Southern Observatory (ESO). Reproduced by permission
2003A&A...405..487H Extragalactic globular clusters in the near infrared III. NGC 5846 and NGC 7192. Quantifying the age distribution of sub-populations Hempel, M.; Hilker, M.; Kissler-Patig, M.; Puzia, T. H.; Minniti, D.; Goudfrooij, P. Abstract. In this third paper of our series on near-IR and optical photometry of globular cluster systems in early-type galaxies we concentrate on the photometric results for NGC 5846 and NGC 7192, two group ellipticals, and on a first comparison between the globular cluster systems investigated so far. In NGC 5846 the colour-colour diagram shows clear bi-modality in (V-K), which is confirmed by a KMM test. The mean colour of both peaks were estimated to be (V-K)_blue_=2.57+/-0.06 and (V-K)_red_=3.18+/-0.06. The situation in NGC 7192 is different, in that the colour-colour diagram gives no evidence for a distinct second population of globular clusters. Using simulated colour distributions of globular cluster systems, we make a first step in quantifying the cumulative age distribution in globular cluster systems. Also here the result for NGC 5846 leads us to the conclusion that its metal-rich globular cluster population contains two globular cluster populations which differ in age by several Gyr. The age structure for NGC 7192 shows instead strong similarity with a single-age population. Keywords: galaxies: star clusters, galaxies: individual: NGC 5846, NGC 7192
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