Five-year wilkinson microwave anisotropy probe observations: Angular power spectra

M. R. Nolta, J. Dunkley, R. S. Hill, G. Hinshaw, E. Komatsu, D. Larson, L. Page, D. N. Spergel, C. L. Bennett, B. Gold, N. Jarosik, N. Odegard, J. L. Weiland, E. Wollack, M. Halpern, A. Kogut, M. Limon, S. S. Meyer, G. S. Tucker, E. L. Wright

Research output: Contribution to journalArticlepeer-review

291 Scopus citations


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)CBB/(2π) < 0.15 μK2 (95% CL).

Original languageEnglish (US)
Pages (from-to)296-305
Number of pages10
JournalAstrophysical Journal, Supplement Series
Issue number2
StatePublished - 2009

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


  • Cosmic microwave background
  • Cosmological parameters
  • Cosmology: observations
  • Early universe
  • Large-scale structure of universe
  • Space vehicles: instruments


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