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 Maximum Entropy Method Maps
HEALPix, nested, res 7 (Nside=128)
The Maximum Entropy Method (MEM) is used to derive all-sky maps of the synchrotron, free-free and dust foregrounds at each of the 5 WMAP frequencies. Using the Smoothed I Maps minus the ILC map as input, representations of each of the foregrounds are fit to each pixel independently. The synchrotron spectrum is allowed to vary for each pixel, while the free-free and dust spectral indices are assumed to be constant over the sky. The MEM technique fits for the separate components by maximizing an entropy functional using the listed templates as priors:
Foreground maps of each component for each frequency band are supplied. Note that the model temperatures are in mK, antenna temperature, rather than in thermodynamic units.