Globular Cluster Metallicity Subpopulations in NGC 4472

Details Globular Cluster Metallicity Subpopulations in NGC 4472 Globular Cluster Metallicity Subpopulations in NGC 4472

2007-01-15

arxiv.org/abs/astro-ph/0701428v1

Astron.J.133:2015-2019,2007

Astronomy and Astrophysics

Astrophysics

Accepted to AJ, 16 pages, 5 figures

Scientific paper

10.1086/512770

Bimodality is a common feature of globular cluster (GC) color distributions in galaxies. Although it is well known that the GC system of the Milky Way is bimodal in metallicity, this has yet to be directly demonstrated for an elliptical galaxy. We use Lick index measurements from the literature to derive metallicities for 47 GCs in the giant Virgo elliptical galaxy NGC 4472. The resulting distribution shows clear evidence for two metallicity subpopulations of GCs.

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