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- Globular clusters in early-type galaxies with GMOS
- Bridges, Terry J.; Beasley, Michael A.; Faifer, Favio Raul; Forbes, Duncan A.; Forte, Juan Carlos; Gebhardt, Karl; Hanes, David A.; Sharples, Ray M.; Zepf, Stephen E.
- 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.
- Publication type
- Conference paper
- Research centre
- Swinburne University of Technology. Faculty of Information and Communication Technologies. Centre for Astrophysics and Supercomputing
- Highlights of Astronomy: as presented at the XXVth General Assembly of the IAU, Sydney, New South Wales, Australia, 13-26 July 2003, Vol. 13, pp. 173-174
- Publication year
- Early-type galaxies; GCs; Gemini South Multi-Object Spectrograph; Globular clusters; GMOS
- Astronomical Society of the Pacific
- 9781583811894, 1583811893
- Publisher URL
- Copyright © 2005 Astronomical Society of the Pacific. The published version is reproduced in accordance with the copyright policy of the publisher.
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