ABOUT LAMBDA

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 five 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. A total of 435 individual cross-power spectra are formed from the three individual years of data and six V- and W-band differencing assemblies.

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 corresponding diagonal elements of the covariance matrix
  4. the portion of the diagonal element of the covariance matrix attributed to measurement errors
  5. the portion of the diagonal element of the covariance matrix attributed to cosmic variance, assuming the best-fit LCDM model described in Dunkley et al. (2008).

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 corresponding diagonal elements of the covariance matrix
  6. the portion of the diagonal element of the covariance matrix attributed to measurement errors
  7. the portion of the diagonal element of the covariance matrix attributed to cosmic variance, assuming the best-fit LCDM model described in Dunkley et al. (2008).

Change Notes

Version 3.0 (5 March 2008) - WMAP five year data release.

Version 3.1 (8 July 2008) - Corrected the data in column 4 to give the portion of the error attributable to measurement error. v3.0 was giving "SN+NN" while the corrected v3.1 gives "2SN+NN".

Additional Information

Back to Product Page

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