Wilkinson Microwave Anisotropy Probe DR4

The data made available through this page has been updated. The most recent version of this data may be accessed through https://lambda.gsfc.nasa.gov/product/wmap/current/"

DR4 TT Power Spectra (includes binned versions)

The seven year TT power spectrum is produced by combining the Maximum Likelihood estimated spectrum from l = 2-32 with the pseudo-C_l based cross-power spectra for l > 32. The pseudo-C_l estimate uses only V- and W-band data, with a uniform pixel weight applied for l ≤ 500 and "Nobs' weights for l > 500.

The complete (unbinned) TT power spectrum data are provided as an ASCII table containing the following columns:

1. the multipole moment l
2. the power spectrum in units of μK²
3. the error derived from the diagonal elements of the covariance matrix in units of μK²
4. the portion of column 3 attributed to measurement errors in units of μK²
5. the portion of column 3 attributed to cosmic variance in units of μK², assuming the best-fit ΛCDM model.

The diagonal elements provide an estimate of the error, but should not be used as exact error bars. The complete Fisher matrix should be used for that purpose.

A binned version of the power spectrum is also available in a separate ASCII file with the following columns:

1. the mean multipole moment l
2. the smallest l contributing to the bin
3. the largest l contributing to the bin
4. the power spectrum in units of μK²
5. the error for the binned value, computed from the diagonal elements of the covariance matrix in units of μK²
6. the portion of column 5 attributed to measurement errors in units of μK²
7. the portion of column 5 attributed to cosmic variance in units of μK², assuming the best-fit ΛCDM model.

Change Notes

Version 4.0 (January 2010) - WMAP seven year data release.

Additional Information

• Seven-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Sky Maps, Systematic Errors, and Basic Results, N. Jarosik, et.al. (2010)
• Seven-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Galactic Foreground Emission, B. Gold, et.al (2010).
• Seven-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Power Spectra and WMAP-Derived Parameters, D. Larson, et.al. (2010)
• Seven-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Assessment of Anomalous CMB Results from WMAP, C. Bennett, et.al. (2010)
• Seven-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation, E. Komatsu, et.al. (2010)
• Seven-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Mars, Jupiter and Saturn, J. Weiland, et.al (2010).
• The Five-Year WMAP Papers
• The Three-Year WMAP Papers
• The First-Year WMAP Papers
• WMAP Seven Year Explanatory Supplement

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