Probing the Epoch of Reionization with the Hubble Ultra Deep Field

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

We derive the expected properties of reionization sources with very low metallicity and show how the z=6 galaxies identified as i-band dropouts in the Hubble Ultra Deep Field and in the GOODS survey would be capable of reionizing the Universe provided their metallicity is very low and/or their mass function is top heavy. We discuss possible alternatives to that of a very low metallicity and how some of these alternatives could be tested with observations.

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