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Globular Clusters in Early-Type Galaxies with GMOS

Published online by Cambridge University Press:  30 March 2016

Terry Bridges ,
Mike Beasley ,
Favio Faifer ,
Duncan Forbes ,
Juan Forte ,
Karl Gebhardt ,
Dave Hanes ,
Ray Sharpies  and
Steve Zepf
Terry Bridges
Affiliation:
AAO, Swinburne, UNLP/CONICET, Swinburne, UNLP/CONICET, U. of Texas, Queen’s U., Durham, Michigan State U.
Mike Beasley
Affiliation:
AAO, Swinburne, UNLP/CONICET, Swinburne, UNLP/CONICET, U. of Texas, Queen’s U., Durham, Michigan State U.
Favio Faifer
Affiliation:
AAO, Swinburne, UNLP/CONICET, Swinburne, UNLP/CONICET, U. of Texas, Queen’s U., Durham, Michigan State U.
Duncan Forbes
Affiliation:
AAO, Swinburne, UNLP/CONICET, Swinburne, UNLP/CONICET, U. of Texas, Queen’s U., Durham, Michigan State U.
Juan Forte
Affiliation:
AAO, Swinburne, UNLP/CONICET, Swinburne, UNLP/CONICET, U. of Texas, Queen’s U., Durham, Michigan State U.
Karl Gebhardt
Affiliation:
AAO, Swinburne, UNLP/CONICET, Swinburne, UNLP/CONICET, U. of Texas, Queen’s U., Durham, Michigan State U.
Dave Hanes
Affiliation:
AAO, Swinburne, UNLP/CONICET, Swinburne, UNLP/CONICET, U. of Texas, Queen’s U., Durham, Michigan State U.
Ray Sharpies
Affiliation:
AAO, Swinburne, UNLP/CONICET, Swinburne, UNLP/CONICET, U. of Texas, Queen’s U., Durham, Michigan State U.
Steve Zepf
Affiliation:
AAO, Swinburne, UNLP/CONICET, Swinburne, UNLP/CONICET, U. of Texas, Queen’s U., Durham, Michigan State U.

Abstract

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We present recent results from our long-term Gemini/GMOS study of globular clusters (GCs) in early-type galaxies. To date, we have obtained photometry and spectroscopy for GCs in NGCs 3379, 4649, 524, 7332, and IC 1459. We find a clear bimodality in the NGC 4649 GC color distribution, with the fraction of blue/red clusters increasing with galacto-centric radius. We derive ages and metallicities for 22 GCs 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 GC 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 GC data.

Type
JD6: Extragalactic Globular Clusters & Their Host Galaxies
Information
Highlights of Astronomy , Volume 13 , 2005 , pp. 173 - 174
Copyright
Copyright © Astronomical Society of Pacific 2005