Wilkinson Microwave Anisotropy Probe DR5
MCMC Foreground Maps
HEALPix, nested, res 6 (Nside=64)
These maps were generated from the MCMC fit described in Gold, et.al.. The inputs are the one degree smoothed maps per frequency band, binned to Nside=64. There is an MCMC chain for each pixel which is used to estimate the likelihood for all the parameters. The maps provided for each parameter are:
Four sets of maps are provided: MCMC Models c, e, f and g as described in Bennett et. al (2013). Each model has a slightly different set of parameters that are allowed to vary.
Model c ('base') assumes a power-law dependence for synchrotron, free-free, and dust, where the synchrotron and dust spectral indices are free parameters.
Model e ('sd070') includes synchrotron, free-free, thermal dust emission, and a spinning dust component. The synchrotron spectral index is fixed to -3. The spinning dust spectrum is fixed to the Cold Neutral Medium spectral form from Silsbee, etal, 2011 with a peak frequency shift parameter of 0.7.
Model f ('bsfree sd084') is similar to Model e, but allows the synchrotron spectral index to vary per pixel (a pure power law is assumed). The spinning dust spectrum uses a fixed shift parameter of 0.84.
Model g ('bsfree Strong sd084') is similar to Model f, but constrains the synchrotron spectral index behavior with frequency to follow that specified in Strong, etal, 2011 instead of a pure power law.
The following parameters are reported:
Temperatures in mK are in antenna units except for the CMB maps, which are provided in thermodymanic units.
The reduced χ2 are the best-fit χ2 divided by the number of degrees of freedom determined from the chain using the "effective complexity".