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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 | Affiliation: | AAO), 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 | 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. | Source: | arXiv, astro-ph/0310324 | Services: | Forum | Review | PDF | Favorites |
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