Planck intermediate results XLVII. Planck constraints on reionization history

File Description SizeFormat 
aa28897-16.pdfPublished version1.73 MBAdobe PDFView/Open
Title: Planck intermediate results XLVII. Planck constraints on reionization history
Authors: Adam, R
Aghanim, N
Ashdown, M
Aumont, J
Baccigalupi, C
Ballardini, M
Banday, AJ
Barreiro, RB
Bartolo, N
Basak, S
Battye, R
Benabed, K
Bernard, J-P
Bersanelli, M
Bielewicz, P
Bock, JJ
Bonaldi, A
Bonavera, L
Bond, JR
Borrill, J
Bouchet, FR
Boulanger, F
Bucher, M
Burigana, C
Calabrese, E
Cardoso, J-F
Carron, J
Chiang, HC
Colombo, LPL
Combet, C
Comis, B
Couchot, F
Coulais, A
Crill, BP
Curto, A
Cuttaia, F
Davis, RJ
De Bernardis, P
De Rosa, A
De Zotti, G
Delabrouille, J
Di Valentino, E
Dickinson, C
Diego, JM
Dore, O
Douspis, M
Ducout, A
Dupac, X
Elsner, F
Ensslin, TA
Eriksen, HK
Falgarone, E
Fantaye, Y
Finelli, F
Forastieri, F
Frailis, M
Fraisse, AA
Franceschi, E
Frolov, A
Galeotta, S
Galli, S
Ganga, K
Genova-Santos, RT
Gerbino, M
Ghosh, T
Gonzalez-Nuevo, J
Gorski, KM
Gruppuso, A
Gudmundsson, JE
Hansen, FK
Helou, G
Henrot-Versille, S
Herranz, D
Hivon, E
Huang, Z
Ilic, S
Jaffe, AH
Jones, WC
Keihanen, E
Keskitalo, R
Kisner, TS
Knox, L
Krachmalnicoff, N
Kunz, M
Kurki-Suonio, H
Lagache, G
Lahteenmaki, A
Lamarre, J-M
Langer, M
Lasenby, A
Lattanzi, M
Lawrence, CR
Le Jeune, M
Levrier, F
Lewis, A
Liguori, M
Lilje, PB
Lopez-Caniego, M
Ma, Y-Z
Macias-Perez, JF
Maggio, G
Mangilli, A
Maris, M
Martin, PG
Martinez-Gonzalez, E
Matarrese, S
Mauri, N
McEwen, JD
Meinhold, PR
Melchiorri, A
Mennella, A
Migliaccio, M
Miville-Deschenes, M-A
Molinari, D
Moneti, A
Montier, L
Morgante, G
Moss, A
Naselsky, P
Natoli, P
Oxborrow, CA
Pagano, L
Paoletti, D
Partridge, B
Patanchon, G
Patrizii, L
Perdereau, O
Perotto, L
Pettorino, V
Piacentini, F
Plaszczynski, S
Polastri, L
Polenta, G
Puget, J-L
Rachen, JP
Racine, B
Reinecke, M
Remazeilles, M
Renzi, A
Rocha, G
Rossetti, M
Roudier, G
Rubino-Martin, JA
Ruiz-Granados, B
Salvati, L
Sandri, M
Savelainen, M
Scott, D
Sirri, G
Sunyaev, R
Suur-Uski, A-S
Tauber, JA
Tenti, M
Toffolatti, L
Tomasi, M
Tristram, M
Trombetti, T
Valiviita, J
Van Tent, F
Vielva, P
Villa, F
Vittorio, N
Wandelt, BD
Wehus, IK
White, M
Zacchei, A
Zonca, A
Item Type: Journal Article
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 ΛCDM models with various parameterizations of the reionization history. We obtain a Thomson optical depth τ = 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 Δz < 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.
Issue Date: 12-Dec-2016
Date of Acceptance: 23-Jul-2016
ISSN: 1432-0746
Publisher: EDP Sciences
Volume: 596
Copyright Statement: © ESO, 2016
Sponsor/Funder: Science and Technology Facilities Council (STFC)
Science and Technology Facilities Council (STFC)
Science and Technology Facilities Council (STFC)
Science and Technology Facilities Council (STFC)
Science and Technology Facilities Council (STFC)
Science and Technology Facilities Council (STFC)
Funder's Grant Number: ST/F01239X/1
Keywords: Science & Technology
Physical Sciences
Astronomy & Astrophysics
cosmic background radiation
dark ages, reionization, first stars
0201 Astronomical And Space Sciences
Publication Status: Published
Open Access location:
Article Number: ARTN A108
Appears in Collections:Physics

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

Creative Commonsx