Globular Clusters in Early-Type Galaxies with GMOS

Details Globular Clusters in Early-Type Galaxies with GMOS Globular Clusters in Early-Type Galaxies with GMOS

2003-10-13

arxiv.org/abs/astro-ph/0310324v1

Astronomy and Astrophysics

Astrophysics

3 pages, 2 figures, uses newpasp.sty (included). 'In press' for "Joint Discussion #6: Extragalactic Globular Clusters and thei

Scientific paper

We present recent results from our long-term Gemini/GMOS study of globular clusters in early-type galaxies. To date, we have obtained photometry and spectroscopy for clusters in NGCs 3379, 4649, 524, 7332, and IC 1459. We find a clear bimodality in the NGC 4649 cluster colour distribution, with the fraction of blue/red clusters increasing with galactocentric radius. We derive ages and metallicities for 22 clusters in NGC 3379, finding that most of the clusters appear old (10-15 Gyr); however, there is a group of 4 metal-rich, younger clusters with ages of 2-6 Gyr. The NGC 3379 cluster velocity dispersion decreases with radius, as does the inferred (local) mass-to-light ratio: there is no evidence for a dark matter halo in NGC 3379 based on our globular cluster data.

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