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Planck intermediate results XLVII. Planck constraints on reionization history
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Number of Authors: 1672016 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 596, article id A108Article in journal (Refereed) Published
Abstract [en]

We investigate constraints on cosmic reionization extracted from the Planck cosmic microwave background (CMB) data. We combine the Planck CMB anisotropy data in temperature with the low-multipole polarization data to fit Lambda CDM models with various parameterizations of the reionization history. We obtain a Thomson optical depth tau = 0.058 +/- 0.012 for the commonly adopted instantaneous reionization model. This confirms, with data solely from CMB anisotropies, the low value suggested by combining Planck 2015 results with other data sets, and also reduces the uncertainties. We reconstruct the history of the ionization fraction using either a symmetric or an asymmetric model for the transition between the neutral and ionized phases. To determine better constraints on the duration of the reionization process, we also make use of measurements of the amplitude of the kinetic Sunyaev-Zeldovich (kSZ) effect using additional information from the high-resolution Atacama Cosmology Telescope and South Pole Telescope experiments. The average redshift at which reionization occurs is found to lie between z = 7.8 and 8.8, depending on the model of reionization adopted. Using kSZ constraints and a redshift-symmetric reionization model, we find an upper limit to the width of the reionization period of Delta z < 2.8. In all cases, we find that the Universe is ionized at less than the 10% level at redshifts above z similar or equal to 10. This suggests that an early onset of reionization is strongly disfavoured by the Planck data. We show that this result also reduces the tension between CMB-based analyses and constraints from other astrophysical sources.

Place, publisher, year, edition, pages
2016. Vol. 596, article id A108
Keywords [en]
cosmic background radiation, dark ages, reionization, first stars, polarization
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:su:diva-139427DOI: 10.1051/0004-6361/201628897ISI: 000390797900066Scopus ID: 2-s2.0-85006341873OAI: oai:DiVA.org:su-139427DiVA, id: diva2:1073431
Available from: 2017-02-10 Created: 2017-02-10 Last updated: 2022-10-18Bibliographically approved

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Gerbino, MartinaGudmundsson, Jón E.

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Gerbino, MartinaGudmundsson, Jón E.
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Department of PhysicsThe Oskar Klein Centre for Cosmo Particle Physics (OKC)Nordic Institute for Theoretical Physics (Nordita)
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Astronomy and Astrophysics
Astronomy, Astrophysics and Cosmology

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