Skip to Main content Skip to Navigation
Journal articles

Planck 2016 intermediate results. XLVII. Planck constraints on reionization history

R. Adam 1 N. Aghanim M. Ashdown J. Aumont C. Baccigalupi M. Ballardini A. J. Banday R. B. Barreiro N. Bartolo S. Basak R. Battye K. Benabed J. Bernard M. Bersanelli P. Bielewicz J. J. Bock A. Bonaldi L. Bonavera J. R. Bond J. Borrill F. R. Bouchet M. Bucher 2 C. Burigana E. Calabrese J. -F. Cardoso 2 J. Carron H. C. Chiang L. P. L. Colombo C. Combet 1 B. Comis 1 A. Coulais 3 B. P. Crill A. Curto F. Cuttaia R. J. Davis P. de Bernardis A. de Rosa G. de Zotti J. Delabrouille 2 E. Di Valentino C. Dickinson J. M. Diego O. Doré M. Douspis A. Ducout X. Dupac F. Elsner T. A. Enßlin H. K. Eriksen E. Falgarone 3 Y. Fantaye F. Finelli F. Forastieri M. Frailis A. A. Fraisse E. Franceschi A. Frolov S. Galeotta S. Galli K. Ganga 2 R. T. Génova-Santos M. Gerbino T. Ghosh J. González-Nuevo K. M. Górski A. Gruppuso J. E. Gudmundsson F. K. Hansen G. Helou S. Henrot-Versillé 4 D. Herranz E. Hivon Z. Huang S. Ili_ A. H. Jaffe W. C. Jones E. Keihänen R. Keskitalo T. S. Kisner L. Knox N. Krachmalnicoff M. Kunz H. Kurki-Suonio Guilaine Lagache 5 A. Lähteenmäki J. -M. Lamarre 3 M. Langer A. Lasenby M. Lattanzi C. R. Lawrence M. Le Jeune 2 F. Levrier 3 A. Lewis M. Liguori P. B. Lilje M. López-Caniego Y. -Z. Ma J.F. Macias-Pérez 1 G. Maggio A. Mangilli M. Maris P. G. Martin E. Martínez-González S. Matarrese N. Mauri J. D. Mcewen P. R. Meinhold A. Melchiorri A. Mennella M. Migliaccio M. -A. Miville-Deschênes D. Molinari A. Moneti L. Montier G. Morgante A. Moss P. Naselsky P. Natoli C. A. Oxborrow L. Pagano D. Paoletti B. Partridge G. Patanchon 2 L. Patrizii O. Perdereau 4 L. Perotto 1 V. Pettorino F. Piacentini Stéphane Plaszczynski 4 L. Polastri G. Polenta J. -L. Puget J. P. Rachen B. Racine 2 M. Reinecke M. Remazeilles 2 A. Renzi G. Rocha M. Rossetti G. Roudier 2, 3 J. A. Rubiño-Martín B. Ruiz-Granados L. Salvati M. Sandri M. Savelainen D. Scott G. Sirri R. Sunyaev A. -S. Suur-Uski J. A. Tauber M. Tenti L. Toffolatti M. Tomasi M. Tristram 4 T. Trombetti J. Valiviita F. van Tent P. Vielva F. Villa N. Vittorio B. D. Wandelt I. K. Wehus M. White A. Zacchei A. Zonca
Abstract : 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 only data 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~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.
Complete list of metadatas
Contributor : Sabine Starita <>
Submitted on : Thursday, May 12, 2016 - 11:32:44 AM
Last modification on : Tuesday, September 22, 2020 - 3:55:59 AM

Links full text



R. Adam, N. Aghanim, M. Ashdown, J. Aumont, C. Baccigalupi, et al.. Planck 2016 intermediate results. XLVII. Planck constraints on reionization history. Astronomy and Astrophysics - A&A, EDP Sciences, 2016, 596, pp.A108. ⟨10.1051/0004-6361/201628897⟩. ⟨in2p3-01314853⟩



Record views