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Planck intermediate results XLVII. Planck constraints on reionization history

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Title: Planck intermediate results XLVII. Planck constraints on reionization history
Author(s): 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.
Publication Date: 12-Dec-2016
Date of Acceptance: 23-Jul-2016
URI: http://hdl.handle.net/10044/1/44469
DOI: http://dx.doi.org/10.1051/0004-6361/201628897
ISSN: 1432-0746
Publisher: EDP Sciences
Journal / Book Title: Astronomy & Astrophysics
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
ST/H001239/1
ST/J001368/1
ST/K001051/1
ST/K004131/1
ST/N001206/1
Keywords: Science & Technology
Physical Sciences
Astronomy & Astrophysics
cosmic background radiation
dark ages, reionization, first stars
polarization
MICROWAVE BACKGROUND ANISOTROPIES
PROBE WMAP OBSERVATIONS
STAR-FORMING GALAXIES
ANGULAR POWER SPECTRUM
HIGH-REDSHIFT GALAXIES
SOUTH-POLE TELESCOPE
DEEP FIELD CAMPAIGN
LY-ALPHA-EMITTERS
SIMILAR-TO 6
COSMIC REIONIZATION
Astronomy & Astrophysics
0201 Astronomical And Space Sciences
Publication Status: Published
Article Number: ARTN A108
Open Access location: http://www.aanda.org/articles/aa/pdf/2016/12/aa28897-16.pdf
Appears in Collections:Physics
Astrophysics



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