2006MNRAS.371L..55C -
Mon. Not. R. Astron. Soc., 371, L55-L59 (2006/September-1)
Updating reionization scenarios after recent data.
CHOUDHURY T.R. and FERRARA A.
Abstract (from CDS):
The recent release of data on (i) high-redshift source counts from the Near Infrared Camera and Multi-Object Spectrometer (NICMOS) Hubble Ultra Deep Field (HUDF) and (ii) electron scattering optical depth from the Wilkinson Microwave Anisotropy Probe (WMAP) requires a re-examination of reionization scenarios. Using an improved self-consistent reionization model, based on Choudhury & Ferrara, we determine the range of reionization histories which can match a wide variety of data sets simultaneously. The updated constraints from our analysis imply that hydrogen reionization starts at around z ~ 15, driven by the metal-free Population III (PopIII) stars (with normal Salpeter-like initial mass functions), and it is 90 per cent complete by z ~ 10. The photoionizing power of the PopIII stars fades for z ≲ 10 because of concomitant action 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, with star-forming efficiencies larger than 2 per cent.
Abstract Copyright:
2006 The Authors. Journal compilation © 2006 RAS
Journal keyword(s):
intergalactic medium - cosmology: theory - large-scale structure of Universe
Simbad objects:
1
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