The reionization history at high redshifts. II. Estimating the optical depth to Thomson scattering from cosmic microwave background polarization

被引:87
作者
Holder, GP
Haiman, Z
Kaplinghat, M
Knox, L
机构
[1] Inst Adv Study, Sch Nat Sci, Princeton, NJ 08540 USA
[2] Columbia Univ, Dept Astron, New York, NY 10027 USA
[3] Univ Calif Davis, Dept Phys, Davis, CA 95616 USA
关键词
cosmic microwave background; cosmology : theory; MASS FUNCTION; EVOLUTION; UNIVERSE; Z-SIMILAR-TO-6; EPOCH; STARS;
D O I
10.1086/377338
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
In light of the recent inference of a high optical depth tau to Thomson scattering from the Wilkinson Microwave Anisotropy Probe (WMAP) data, we investigate the effects of extended periods of partial ionization and ask if the value of tau inferred by assuming a single sharp transition is an unbiased estimate. We construct and consider several representative ionization models and evaluate their signatures in the cosmic microwave background (CMB). If tau is estimated with a single sharp transition, we show that there can be a significant bias in the derived value ( and, therefore, a bias in sigma(8) as well). For WMAP noise levels, the bias in tau is smaller than the statistical uncertainty, but for Planck or a cosmic variance limited experiment the tau bias could be much larger than the statistical uncertainties. This bias can be reduced in the ionization models we consider by fitting a slightly more complicated ionization history, such as a two-step ionization process. Assuming this two-step process, we find that the Planck satellite can simultaneously determine the initial red-shift of reionization to +/- 2 and tau to +/- 0.01. Uncertainty about the ionization history appears to provide a limit of similar to 0.005 on how well tau can be estimated from CMB polarization data, much better than expected from WMAP but significantly worse than expected from cosmic variance limits.
引用
收藏
页码:13 / 18
页数:6
相关论文
共 19 条
[1]   Evidence for reionization at z ∼ 6:: Detection of a Gunn-Peterson trough in a z=6.28 quasar [J].
Becker, RH ;
Fan, XH ;
White, RL ;
Strauss, MA ;
Narayanan, VK ;
Lupton, RH ;
Gunn, JE ;
Annis, J ;
Bahcall, NA ;
Brinkmann, J ;
Connolly, AJ ;
Csabai, I ;
Czarapata, PC ;
Doi, M ;
Heckman, TM ;
Hennessy, GS ;
Ivezic, Z ;
Knapp, GR ;
Lamb, DQ ;
McKay, TA ;
Munn, JA ;
Nash, T ;
Nichol, R ;
Pier, JR ;
Richards, GT ;
Schneider, DP ;
Stoughton, C ;
Szalay, AS ;
Thakar, AR ;
York, DG .
ASTRONOMICAL JOURNAL, 2001, 122 (06) :2850-2857
[2]   Generic spectrum and ionization efficiency of a heavy initial mass function for the first stars [J].
Bromm, V ;
Kudritzki, RP ;
Loeb, A .
ASTROPHYSICAL JOURNAL, 2001, 552 (02) :464-472
[3]   How is the reionization epoch defined? [J].
Bruscoli, M ;
Ferrara, A ;
Scannapieco, E .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2002, 330 (02) :L43-L47
[4]   The universe was reionized twice [J].
Cen, RY .
ASTROPHYSICAL JOURNAL, 2003, 591 (01) :12-37
[5]   Evolution of the ionizing radiation background and star formation in the aftermath of cosmological reionization [J].
Cen, RY ;
McDonald, P .
ASTROPHYSICAL JOURNAL, 2002, 570 (02) :457-462
[6]   Evolution of the ionizing background and the epoch of reionization from the spectra of z ∼ 6 quasars [J].
Fan, XH ;
Narayanan, VK ;
Strauss, MA ;
White, RL ;
Becker, RH ;
Pentericci, L ;
Rix, HW .
ASTRONOMICAL JOURNAL, 2002, 123 (03) :1247-1257
[7]   The reionization history at high redshifts. I. Physical models and new constraints from cosmic microwave background polarization [J].
Haiman, Z ;
Holder, GP .
ASTROPHYSICAL JOURNAL, 2003, 595 (01) :1-12
[8]   Dark energy and matter evolution from lensing tomography [J].
Hu, W .
PHYSICAL REVIEW D, 2002, 66 (08)
[9]   The mass function of dark matter haloes [J].
Jenkins, A ;
Frenk, CS ;
White, SDM ;
Colberg, JM ;
Cole, S ;
Evrard, AE ;
Couchman, HMP ;
Yoshida, N .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2001, 321 (02) :372-384
[10]   Probing the reionization history of the universe using the cosmic microwave background polarization [J].
Kaplinghat, M ;
Chu, M ;
Haiman, ZN ;
Holder, GP ;
Knox, L ;
Skordis, C .
ASTROPHYSICAL JOURNAL, 2003, 583 (01) :24-32