Foreground Maps in WMAP frequency bands
  This paper provides full sky maps of foreground emission in all WMAP
channels, with very low residual contamination from the Cosmic Microwave
Background (CMB) anisotropies and controlled level of instrumental noise.
Foreground maps are obtained by subtraction of a properly filtered CMB map,
obtained from linear combinations of needlet-based representations of all WMAP
observations and of a 100-micron map. The error in the reconstructed foreground
maps on large scales is significantly lower than the original error due to CMB
contamination, while remaining of the order of the original WMAP noise on small
scales. The level of the noise is estimated, which permits to implement local
filters for maximising the local signal to noise ratio. An example of such
filtering, which reduces the small scale noise using latitude dependent filters
is implemented. This enhances significantly the contrast of galactic emission,
in particular on intermediate angular scales and at intermediate galactic
latitude. The clean WMAP foreground maps can be used to study the galactic
interstellar medium, in particular for the highest frequency channels for which
the proper subtraction of CMB contamination is mandatory. The foregrounds maps
can be downloaded from a dedicated web site.
