Planck intermediate results - XLVII. Planck constraints on reionization history

@article{Adam2016PlanckIR,
  title={Planck intermediate results - XLVII. Planck constraints on reionization history},
  author={Planck Collaboration R. Adam and Nabila Aghanim and Mark Ashdown and J. Aumont and Carlo Baccigalupi and Mario Ballardini and Anthony J. Banday and Rita Bel{\'e}n Barreiro and Nicola Bartolo and Soumen Basak and Richard A. Battye and Karim Benabed and J-Ph. Bernard and M. Bersanelli and Pawel Bielewicz and James J. Bock and Anna Bonaldi and Laura Bonavera and J. Richard Bond and Julian Borrill and F. R. Bouchet and Manfred Bucher and C. Burigana and Erminia Calabrese and J.-F. Cardoso and Julien Carron and H. Cynthia Chiang and Loris P. L. Colombo and C{\'e}line Combet and Barbara Comis and A. Coulais and Brendan P. Crill and A. Fernandez Curto and F. Cuttaia and R. J. Davis and Paolo Bernardis and Alessandra De Rosa and Gianfranco de Zotti and Jacques Delabrouille and Eleonora Di Valentino and Clive Dickinson and Jose M. Diego and Olivier Dor'e and Marian Douspis and Anne Ducout and Xavier Dupac and Franz Elsner and Torsten A. Ensslin and Hans Kristian Eriksen and E. Falgarone and Yabebal T. Fantaye and Fabio Finelli and Francesco Forastieri and Marco Frailis and Aur'elien A. Fraisse and Enrico Franceschi and Andrei V. Frolov and S. Galeotta and Silvia Galli and Kenneth Matthew Ganga and Ricardo T. G'enova-Santos and Martina Gerbino and Tuhin Ghosh and Joaquin Gonz'alez-Nuevo and Krzysztof M. G'orski and Alessandro Gruppuso and Jon E. Gudmundsson and Frode K. Hansen and George Helou and Sophie Henrot-Versill'e and Diego Herranz and E. Hivon and Z. Huang and S. Ili and Andrew H. Jaffe and William C Jones and Elina Keihanen and Reijo Keskitalo and Theodore Kisner and Lloyd Knox and Nicoletta Krachmalnicoff and Martin Kunz and Hannu Kurki-Suonio and Guilaine Lagache and Anne Lahteenmaki and J-M. Lamarre and Mathieu Langer and Anthony N. Lasenby and Massimiliano Lattanzi and Charles R. Lawrence and Maude Le Jeune and François L{\'e}vrier and A. M. Lewis and Michele Liguori and Per B. Lilje and Marcos L'opez-Caniego and Y.-Z. Ma and Juan Francisco Mac'ias-P'erez and G. Maggio and Anna Mangilli and M. Maris and P. G. Martin and E. Mart'inez-Gonz'alez and S. Matarrese and Nicoletta Mauri and Jason D. McEwen and P. Meinhold and Alessandro Melchiorri and A. Mennella and Marina Migliaccio and Marc-Antoine Miville-Desch{\^e}nes and Diego Molinari and Andrea Moneti and Laurent Montier and Gianluca Morgante and Adam Moss and Pavel D. Naselsky and Paolo Natoli and Carol Anne Oxborrow and Luca Pagano and Daniela Paoletti and Bruce Partridge and Guillaume Patanchon and Laura Patrizii and Olivier Perdereau and L. Perotto and Valeria Pettorino and Francesco Piacentini and St{\'e}phane Plaszczynski and Linda Polastri and Gianluca Polenta and J-L. Puget and Jorg P. Rachen and Benjamin Racine and Martin Reinecke and Mathieu Remazeilles and Alessandro Renzi and Graca M. Rocha and Mariachiara Rossetti and Gael M. Roudier and Jos'e Alberto Rubino-Mart'in and Beatriz Ruiz-Granados and Laura Salvati and M. Sandri and Matti Savelainen and Douglas Scott and G. Sirri and Rashid Alievich Sunyaev and A.-S. Suur-Uski and Jan Tauber and M. Tenti and Luigi Toffolatti and Maurizio Tomasi and M. Tristram and Tiziana Trombetti and Jussi Valiviita and F. Van Tent and Patricio Vielva and Fabrizio Villa and Nicola Vittorio and Benjamin D. Wandelt and Ingunn Kathrine Wehus and Martin White and Andrea Zacchei and Andrea Zonca},
  journal={Astronomy and Astrophysics},
  year={2016},
  volume={596},
  pages={1-19}
}
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… Expand
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