Galaxies in the First Billion Years: Implications for Reionization and the Star Formation History at z>6

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Scientific paper

We discuss the selection of star-forming galaxies at z˜ 6 through the Lyman-break technique. Spitzer imaging implies many of these contain older stellar populations (>200 Myr) which produce detectable Balmer breaks. The ages and stellar masses (˜ 10^{10} M_{&sun;}) imply that the star formation rate density at earlier epochs may have been significantly higher than at z˜ 6, and might have played a key role in reionizing the Universe.

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