Soumen Basak, Jacques Delabrouille
We estimate Cosmic Microwave Background (CMB) polarisation power spectra, and temperature-polarisation cross-spectra, from 7-year data of the Wilkinson Microwave Anisotropy Probe (WMAP). Foreground cleaning is implemented using needlet decompositions of sky maps for all WMAP channels, to produce maps for CMB temperature anisotropies (T-mode) and polarisation (E-mode and B-mode), for seven different years of observation. Power spectra are computed using a pixel-weighted scheme, from averages of independent cross-power estimates using foreground-cleaned maps for the different years. Error bars are estimated from the scatter of all possible independent measurements of the band-averaged power spectra, and hence are independent of any detailed model of the WMAP noise.
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http://arxiv.org/abs/1204.0292
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