A needlet ILC analysis of WMAP 7-year data: estimation of CMB
  temperature map and power spectrum
  The WMAP 7-year temperature maps have been re-analized to extract a CMB map
and CMB power spectrum with reduced contamination by astrophysical foregrounds
and noise. The method used is based on linear combinations of WMAP data and
foreground templates, implemented on a decomposition of the observations onto a
needlet frame. We obtain a clean CMB map with low contamination from
foregrounds and noise, as well as a new estimate of the CMB temperature power
spectrum. The latter is essentially compatible with the power spectrum
published by the WMAP collaboration, although it is slightly but systematically
lower on large scales. The exact origin of this discrepancy is not clear.
