Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-06-20
Astronomy and Astrophysics
Astrophysics
2 pages, Latex, 2 figures, To appear in the proceedings of Galaxy Evolution: Theory and Observations, ed. V. Avila-Reese, C. F
Scientific paper
Globular clusters provide a unique probe of galaxy formation and evolution. Here I briefly summarize the known observational properties of globular cluster systems. One re-occurring theme is that the globular cluster systems of spirals and ellipticals are remarkably similar. Photometry, and the limited spectra available, are consistent with metal-poor clusters forming before the main spheroid component is established and the metal-rich ones forming at the same time as the spheroid in a burst of star formation. These observations are compared to a model for globular cluster formation in a LCDM hierarchical universe. One model result reported here is that S_N is determined at early times and little affected by late epoch mergers.
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