Updating reionization scenarios after recent data

Details Updating reionization scenarios after recent data Updating reionization scenarios after recent data

2006-03-23

arxiv.org/abs/astro-ph/0603617v2

Mon.Not.Roy.Astron.Soc.371:L55-L59,2006

Astronomy and Astrophysics

Astrophysics

Typos corrected. MNRAS Letters in press

Scientific paper

10.1111/j.1745-3933.2006.00207.x

The recent release of data on (i) high redshift source counts from NICMOS HUDF, and (ii) electron scattering optical depth from 3-year WMAP, require a re-examination of reionization scenarios. Using an improved self-consistent model, based on Choudhury & Ferrara (2005), we determine the range of reionization histories which can match a wide variety of data sets simultaneously. From this improved analysis we find that hydrogen reionization starts around z = 15, driven by the metal-free stars (with normal Salpeter-like IMF), and is 90% complete by z = 10. The photoionizing power of PopIII stars fades for z < 10 because of the concomitant action of radiative and chemical feedbacks, which causes the reionization process to stretch considerably and to end only by z = 6. The combination of different data sets still favours a non-zero contribution from metal-free stars, forming with efficiencies > 2%.

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