Extragalactic Globular Clusters: Old Spectroscopic Ages and New Views on Their Formation

Bibcode
2005AJ....130.1315S
DOI
10.1086/432717
Strader, Jay; Brodie, Jean P.; Cenarro, A. J.; Beasley, Michael A.; Forbes, Duncan A.
Referencia bibliográfica

The Astronomical Journal, Volume 130, Issue 4, pp. 1315-1323.

Fecha de publicación:
10
2005
Número de autores
5
Número de autores del IAC
0
Número de citas
107
Número de citas referidas
99
Descripción
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.
Tipo
Con árbitro
Galaxias
Cúmulos de estrellas

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