Jay Strader et al. 2005 The Astronomical Journal 130 1315 doi:10.1086/432717
Extragalactic Globular Clusters: Old Spectroscopic Ages and New Views on Their Formation
FREEJay Strader1, Jean P. Brodie1, A. J. Cenarro1, Michael A. Beasley1 and Duncan A. Forbes2
Show affiliationsWe 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; globular clusters: general
- Dates
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Issue 4 (2005 October)
Received 2005 March 1, accepted for publication 2005 June 14
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Extragalactic Globular Clusters: Old Spectroscopic Ages and New Views on Their Formation
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