Reionization on Large Scales III: Predictions for Low-ell Cosmic Microwave Background Polarization and High-ell Kinetic Sunyaev-Zel'dovich Observables
نویسندگان
چکیده
We present new predictions for temperature (on small angular scales) and polarization (on large angular scales) CMB anisotropies induced during the epoch of reionization (EoR). Using a novel method calibrated from radiation-hydrodynamic simulations we model the EoR in large volumes (L & 2 Gpc/h). We find that the EoR contribution to the kinetic SunyaevZel’dovich power spectrum (patchy kSZ) ranges between ∼0.6 2.8 μK at l = 3000, for the explored parameter space. For each model, the patchy kSZ power spectrum is calculated from 3 large 15◦× 15◦ maps for better numerical convergence. Decreasing the size of these maps biases the overall patchy kSZ power to higher values. We find that the amplitude of the patchy kSZ power spectrum at l = 3000 follows simple scalings of D l=3000 ∝ z̄ and D kSZ l=3000 ∝ ∆ 0.47 z for the mean redshift (z̄) and duration (∆z) of reionization. Using the constraints on z̄ from the WMAP 7-year results and the lower limit on ∆z from EDGES we find a lower limit of ∼ 0.4μK at l = 3000. Planck will constrain the mean redshift and the Thomson optical depth from the low-l polarization power spectrum. Future measurements of the high-l CMB power spectrum from the South Pole Telescope (SPT) and the Atacama Cosmology Telescope (ACT) should detect the patchy kSZ signal if the cross correlation between the cosmic infrared background and the thermal Sunyaev Zel’dovich effect is constrained. We show that the combination of temperature and polarization measurements constrains both z̄ and ∆z. The patchy kSZ maps, power spectra templates and the polarization power spectra will be publicly available. Subject headings: Cosmic Microwave Background — Cosmology: Theory — Galaxies: Clusters: General — Large-Scale Structure of Universe — Methods: Numerical
منابع مشابه
Secondary CMB Anisotropies from Cosmological Reionization
We use numerical simulation of cosmological reionization to calculate the secondary CMB anisotropies in a representative flat low density cosmological model. We show that the kinetic Sunyaev-Zel’dovich effect (scattering off of moving electrons in the ionized intergalactic medium) is dominated by the nonlinear hydrodynamic and gravitational evolution of the density and velocity fields, rather t...
متن کاملReionization Revisited: Secondary Cosmic Microwave Background Anisotropies and Polarization
Secondary cosmic microwave background (CMB) anisotropies and polarization provide a laboratory for studying structure formation in the reionized epoch. We consider the kinetic Sunyaev-Zeldovich e†ect from mildly nonlinear large-scale structure and show that it is a natural extension of the perturbative Vishniac e†ect. If the gas traces the dark matter to overdensities of order 10, as expected f...
متن کاملSeparating the Weak Lensing and Kinetic Sunyaev-zeldovich Effects from Cosmic Microwave Background Temperature Maps
A new generation of cosmic microwave background (CMB) experiments will soonmake sensitive high-resolution maps of the microwave sky. At angular scales less than 100, most CMB anisotropies are generated at z < 1000, rather than at the surface of last scattering. Therefore, these maps potentially contain an enormous amount of information about the evolution of structure. Whereas spectral informat...
متن کاملAnna Mangilli IRAP , Toulouse ( France ) Statistical methods for large scale polarisation
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 ⇤CDM models with various parameterizations of the reionization histo y. We obtain a Thomson optical depth ⌧ = 0.058 ± 0.012 for the commonly adopted instantaneous reionization ...
متن کاملPlanck intermediate results - XLVII. Planck constraints on reionization history
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 mo...
متن کامل