Forming Globular Cluster Systems in a Semi-analytic Scheme

Details Forming Globular Cluster Systems in a Semi-analytic Scheme Forming Globular Cluster Systems in a Semi-analytic Scheme

2002-10-24

arxiv.org/abs/astro-ph/0210528v1

Astronomy and Astrophysics

Astrophysics

6 pages, 4 figures. Contributed talk given at the ESO workshop "Extragalactic Globular Cluster Systems", August 2002, Garching

Scientific paper

10.1007/10857603_52

We apply the semi-analytical galaxy formation code of Cole et al. to investigate the formation of globular cluster (GC) systems in hierarchical clustering scenarios. The nature of the model allows us to investigate the properties of GC systems and their parent galaxies within a cosmological framework, over a wide dynamic range of mass and time resolution. Assuming GCs form during mergers of gaseous systems, the metal-rich peak of the classical 'bimodal' metallicity distribution of GCs naturally falls out of our model, where such merging occurs over a wide range of redshifts. The physical origin of old, metal-poor GCs (the metal-poor peak) is harder to understand, since their formation must be decoupled from the ongoing star formation in these systems at high redshift (z~5). Within the context of semi-analytic models in general, a possible solution lies in a cut-off in the GC formation efficiency at a characteristic local star formation rate.

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