Abstract
The chemical composition of the Milky-Way halo is studied on the basis of a sample of metal-poor (logarithmic metallicity less than –1) globular clusters. The histogram obtained may be interpreted in the terms of the classical galaxy formation theory of Eggen, Lynden-Bell and Sandage. Interestingly enough, this is in a rough agreement with the data on metallicity of high-redshift damped Ly-alpha and Ly-alpha forest systems. This may serve the important purpose of constraining the nature and the formation timescale of MACHOs discovered through gravitational microlensing experiments.
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