Abstract
We present the temperature and polarization angular power spectra of the cosmic microwave background derived from the first five years of Wilkinson Microwave Anisotropy Probe data. The five-year temperature spectrum is cosmic variance limited up to multipole ℓ = 530, and individual ℓ-modes have signal-to-noise ratio S/N > 1 for ℓ < 920. The best-fitting six-parameter ACDM model has a reduced χ2 for ℓ = 33-1000 of χ2/ = 1.06, with a probability to exceed of 9.3%. There is now significantly improved data near the third peak which leads to improved cosmological constraints. The temperature-polarization correlation is seen with high significance. After accounting for foreground emission, the low-ℓ reionization feature in the EE power spectrum is preferred by Δχ2 = 19.6 for optical depth τ = 0.089 by the EE data alone, and is now largely cosmic variance limited for ℓ = 2-6. There is no evidence for cosmic signal in the BB, TB, or EB spectra after accounting for foreground emission. We find that, when averaged over ℓ = 2-6, ℓ(ℓ + 1)CBBℓ/(2π) < 0.15 μK2 (95% CL).
Original language | English (US) |
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Pages (from-to) | 296-305 |
Number of pages | 10 |
Journal | Astrophysical Journal, Supplement Series |
Volume | 180 |
Issue number | 2 |
DOIs | |
State | Published - 2009 |
All Science Journal Classification (ASJC) codes
- Astronomy and Astrophysics
- Space and Planetary Science
Keywords
- Cosmic microwave background
- Cosmological parameters
- Cosmology: observations
- Early universe
- Large-scale structure of universe
- Space vehicles: instruments