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WMAP

Wilkinson Microwave Anisotropy Probe

The data made available through this page has been updated. The most recent version of this data may be accessed through /product/map/current/

Product Name
TT Power Spectra (includes binned versions)
Mission
WMAP

Description

The seven year TT power spectrum is produced by combining the Maximum Likelihood estimated spectrum from l = 2-32 with the pseudo-Cl based cross-power spectra for l > 32. The pseudo-Cl 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

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A service of the HEASARC and of the Astrophysics Science Division at NASA/GSFC
Goddard Space Flight Center, National Aeronautics and Space Administration
HEASARC Director: Dr. Alan P. Smale
LAMBDA Director: Dr. Eric R. Switzer
NASA Official: Dr. Eric R. Switzer
Web Curator: Mr. Michael R. Greason