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28 March 2024
 
  » arxiv » astro-ph/0310324

 Article overview


Globular Clusters in Early-Type Galaxies with GMOS
Terry Bridges ; Mike Beasley ; Favio Faifer ; Duncan Forbes ; Juan Forte ; Karl Gebhardt ; Dave Hanes ; Ray Sharples ; Steve Zepf ;
Date 13 Oct 2003
Subject astro-ph
AffiliationAAO), Mike Beasley (Swinburne), Favio Faifer (UNLP/CONICET), Duncan Forbes (Swinburne), Juan Forte (UNLP/CONICET), Karl Gebhardt (U. Texas), Dave Hanes (Queen’s), Ray Sharples (Durham), Steve Zepf (Michigan State
AbstractWe 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.
Source arXiv, astro-ph/0310324
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