Planck 中间结果。XLVII. Planck 对再电离历史的约束
宇宙学与河外天体物理
2016-12-14 v3
摘要
我们研究了从 Planck 宇宙微波背景（CMB）数据中提取的对宇宙再电离的约束。我们将 Planck CMB 温度各向异性数据与低多极矩偏振数据相结合，以拟合具有各种再电离历史参数化的 LCDM 模型。对于普遍采用的瞬时再电离模型，我们得到汤姆逊光深 τ=0.058 ± 0.012。这仅利用 CMB 各向异性数据就证实了结合 Planck 2015 结果与其他数据集所暗示的低值，并减小了不确定性。我们使用对称或非对称模型重建了中性相与电离相之间过渡的电离率历史。为了更好地确定再电离过程持续时间的约束，我们还利用高分辨率阿塔卡马宇宙学望远镜（Atacama Cosmology Telescope）和南极望远镜（South Pole Telescope）实验的额外信息，测量了动力学 Sunyaev-Zeldovich（kSZ）效应的幅度。发现再电离发生的平均红移位于 z=7.8 到 8.8 之间，具体取决于所采用的再电离模型。利用 kSZ 约束和一个红移对称再电离模型，我们发现再电离时期宽度的上限为 Δz < 2.8。在所有情况下，我们发现在红移高于 z~10 时，宇宙的电离程度低于 10%。这表明 Planck 数据强烈不支持再电离的早期开始。我们证明这一结果也减少了基于 CMB 的分析与其他天体物理源约束之间的紧张关系。
引用
@article{arxiv.1605.03507,
title = {Planck intermediate results. XLVII. Planck constraints on reionization history},
author = {Planck Collaboration and R. Adam and N. Aghanim and M. Ashdown and J. Aumont and C. Baccigalupi and M. Ballardini and A. J. Banday and R. B. Barreiro and N. Bartolo and S. Basak and R. Battye and K. Benabed and J. -P. Bernard and M. Bersanelli and P. Bielewicz and J. J. Bock and A. Bonaldi and L. Bonavera and J. R. Bond and J. Borrill and F. R. Bouchet and M. Bucher and C. Burigana and E. Calabrese and J. -F. Cardoso and J. Carron and H. C. Chiang and L. P. L. Colombo and C. Combet and B. Comis and A. Coulais and B. P. Crill and A. Curto and F. Cuttaia and R. J. Davis and P. de Bernardis and A. de Rosa and G. de Zotti and J. Delabrouille and E. Di Valentino and C. Dickinson and J. M. Diego and O. Doré and M. Douspis and A. Ducout and X. Dupac and F. Elsner and T. A. Enßlin and H. K. Eriksen and E. Falgarone and Y. Fantaye and F. Finelli and F. Forastieri and M. Frailis and A. A. Fraisse and E. Franceschi and A. Frolov and S. Galeotta and S. Galli and K. Ganga and R. T. Génova-Santos and M. Gerbino and T. Ghosh and J. González-Nuevo and K. M. Górski and A. Gruppuso and J. E. Gudmundsson and F. K. Hansen and G. Helou and S. Henrot-Versillé and D. Herranz and E. Hivon and Z. Huang and S. Ili_ and A. H. Jaffe and W. C. Jones and E. Keihänen and R. Keskitalo and T. S. Kisner and L. Knox and N. Krachmalnicoff and M. Kunz and H. Kurki-Suonio and G. Lagache and A. Lähteenmäki and J. -M. Lamarre and M. Langer and A. Lasenby and M. Lattanzi and C. R. Lawrence and M. Le Jeune and F. Levrier and A. Lewis and M. Liguori and P. B. Lilje and M. López-Caniego and Y. -Z. Ma and J. F. Macías-Pérez and G. Maggio and A. Mangilli and M. Maris and P. G. Martin and E. Martínez-González and S. Matarrese and N. Mauri and J. D. McEwen and P. R. Meinhold and A. Melchiorri and A. Mennella and M. Migliaccio and M. -A. Miville-Deschênes and D. Molinari and A. Moneti and L. Montier and G. Morgante and A. Moss and P. Naselsky and P. Natoli and C. A. Oxborrow and L. Pagano and D. Paoletti and B. Partridge and G. Patanchon and L. Patrizii and O. Perdereau and L. Perotto and V. Pettorino and F. Piacentini and S. Plaszczynski and L. Polastri and G. Polenta and J. -L. Puget and J. P. Rachen and B. Racine and M. Reinecke and M. Remazeilles and A. Renzi and G. Rocha and M. Rossetti and G. Roudier and J. A. Rubiño-Martín and B. Ruiz-Granados and L. Salvati and M. Sandri and M. Savelainen and D. Scott and G. Sirri and R. Sunyaev and A. -S. Suur-Uski and J. A. Tauber and M. Tenti and L. Toffolatti and M. Tomasi and M. Tristram and T. Trombetti and J. Valiviita and F. Van Tent and P. Vielva and F. Villa and N. Vittorio and B. D. Wandelt and I. K. Wehus and M. White and A. Zacchei and A. Zonca},
journal= {arXiv preprint arXiv:1605.03507},
year = {2016}
}
备注
19 pages, 18 figures. accepted in A&A