Extragalactic globular clusters in the near infrared III. NGC 5846 and NGC 7192: Quantifying the age distribution of sub-populations

M. Hempel, M. Hilker, M. Kissler-Patig, T. H. Puzia, D. Minniti, P. Goudfrooij

Resultado de la investigación: Contribución a una revistaArtículorevisión exhaustiva

37 Citas (Scopus)

Resumen

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.

Idioma originalInglés
Páginas (desde-hasta)487-497
Número de páginas11
PublicaciónAstronomy and Astrophysics
Volumen405
N.º2
DOI
EstadoPublicada - jul 2003

Áreas temáticas de ASJC Scopus

  • Astronomía y astrofísica
  • Ciencias planetarias y espacial

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