Issue |
A&A
Volume 580, August 2015
|
|
---|---|---|
Article Number | L4 | |
Number of page(s) | 4 | |
Section | Letters | |
DOI | https://doi.org/10.1051/0004-6361/201526543 | |
Published online | 30 July 2015 |
A new parameterization of the reionisation history
1 Institut d’Astrophysique Spatiale, Université Paris-Sud, CNRS, UMR8617, 91405 Orsay, France
e-mail: marian.douspis@ias.u-psud.fr
2 IRAP, Université de Toulouse, UPS-OMP, CNRS, 14 avenue Edouard Belin, 31400 Toulouse, France
Received: 17 May 2015
Accepted: 28 June 2015
Motivated by the current constraints on the epoch of reionisation from recent cosmic microwave background observations, ionising background measurements of star-forming galaxies, and low redshifts line-of-sight probes, we propose a new data-motivated parameterisation of the history of the average ionisation fraction. This parameterisation describes a flexible redshift-asymmetric reionisation process in two regimes that is capable of fitting all the current constraints.
Key words: dark ages, reionization, first stars / large-scale structure of Universe / cosmic background radiation
© ESO, 2015
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