Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/37243

Title

Globular clusters in early-type galaxies with GMOS

Author(s)

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.

Abstract

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

Source

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

2005

Keyword(s)

Early-type galaxies;  GCs;  Gemini South Multi-Object Spectrograph;  Globular clusters;  GMOS

Publisher

Astronomical Society of the Pacific

ISBN

9781583811894, 1583811893