Reionization on Large Scales III: Predictions for Low-ell Cosmic Microwave Background Polarization and High-ell Kinetic Sunyaev-Zel'dovich Observables

نویسندگان

  • Nicholas Battaglia
  • Aravind Natarajan
  • Renyue Cen
  • Abraham Loeb
  • N. Battaglia
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

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تاریخ انتشار 2016