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Multiresolution internal template cleaning: an application to the Wilkinson Microwave Anisotropy Probe 7-yr polarization data

AuthorsFernández-Cobos, R. ; Vielva, P. ; Barreiro, R. Belén ; Martínez-González, Enrique
KeywordsMethods: data analysis
Cosmic background radiation
Issue DateMar-2012
PublisherOxford University Press
Royal Astronomical Society
CitationMonthly Notices of the Royal Astronomical Society 420(3): 2162-2169 (2012)
AbstractThe cosmic microwave background (CMB) radiation data obtained by different experiments contain, besides the desired signal, a superposition of microwave sky contributions. Using a wavelet decomposition on the sphere, we present a fast and robust method to recover the CMB signal from microwave maps. We present an application to the Wilkinson Microwave Anisotropy Probe (WMAP) polarization data, which shows its good performance, particularly in very polluted regions of the sky. The applied wavelet has the advantages that it requires little computational time in its calculations, it is adapted to the HEALPIX pixelization scheme and it offers the possibility of multiresolution analysis. The decomposition is implemented as part of a fully internal template fitting method, minimizing the variance of the resulting map at each scale. Using a χ2 characterization of the noise, we find that the residuals of the cleaned maps are compatible with those expected from the instrumental noise. The maps are also comparable to those obtained from the WMAP team, but in our case we do not make use of external data sets. In addition, at low resolution, our cleaned maps present a lower level of noise. The E-mode power spectrum CEE is computed at high and low resolutions, and a cross-power spectrum CTE is also calculated from the foreground reduced maps of temperature given by WMAP and our cleaned maps of polarization at high resolution. These spectra are consistent with the power spectra supplied by the WMAP team.We detect the E- mode acoustic peak at l-400, as predicted by the standard ^CDM model. The B-mode power spectrum CBB is compatible with zero.
Description8 páginas, 6 figuras, 4 tablas.
Publisher version (URL)http://dx.doi.org/10.1111/j.1365-2966.2011.20182.x
Appears in Collections:(IFCA) Artículos
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