American Astronomical Society, Astrophysical Journal Letters, 2(716), p. L190-L194, 2010
DOI: 10.1088/2041-8205/716/2/l190
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We study the clustering properties of the first galaxies formed in the Universe. We find that, due to chemical enrichment of the inter-stellar medium by isolated Population III stars formed in mini-halos at redshift z>30, the (chronologically) first galaxies are composed of metal-poor Population II stars and are highly clustered on small scales. In contrast, chemically pristine galaxies in halos with mass M~10^8 M_sun may form at z