NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-16 T00:16:45 PDT
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For refcode 2005AJ....130.1315S:
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2005AJ....130.1315S Extragalactic Globular Clusters: Old Spectroscopic Ages and New Views on Their Formation Jay Strader, Jean P. Brodie, A. J. Cenarro, Michael A. Beasley, and Duncan A. Forbes Abstract. We present the results of a meta-analysis of Keck spectra of extragalactic globular clusters (GCs) in a sample of eight galaxies, ranging from dwarf galaxies to massive elliptical galaxies. We infer ages for the metal-poor and metal-rich GCs in these galaxies through comparisons to Galactic GCs. Both subpopulations appear to be no younger than their Galactic counterparts, with ages >~10 Gyr. This is the largest sample of galaxies for which ages have been constrained spectroscopically. Our results support the formation of most GCs in massive galaxies at high redshift. We propose a scenario for the formation of GC subpopulations that synthesizes aspects of both accretion and in situ approaches in the context of galaxy formation through hierarchical merging. Keywords: Galaxies: Formation, Galaxies: Star Clusters, Galaxy: Globular Clusters: General
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