A needlet ILC analysis of WMAP 7-year polarisation data: CMB polarisation power spectra

Details A needlet ILC analysis of WMAP 7-year polarisation data: CMB polarisation power spectra A needlet ILC analysis of WMAP 7-year polarisation data: CMB polarisation power spectra

2012-04-02

arxiv.org/abs/1204.0292v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

12 pages, 8 figures

Scientific paper

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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