Foreground analysis from the 1-year Wilkinson Microwave Anisotropy Probe (WMAP) data

Abstract

We present a detailed analysis on the phases of the WMAP foregrounds (synchrotron, free-free and dust emission) of the WMAP K-W bands in order to estimate the significance of the variation of the spectral indices at different components. We first extract the spectral-index varying signals by assuming that the invariant part among different frequency bands have 100% cross-correlation of phases. We then use the minimization of variance, which is normally used for extracting the CMB signals, to extract the frequency independent signals. Such a common signal in each foreground component could play a significant role for any kind of component separation methods, because the methods cannot discriminate frequency independent foregrounds and CMB.

For high-resolution paper see http://www.nbi.dk/~chiang/wmap.html In the revised version we add a new section for cross correlation of phases between the derived CMB and the spectral index varying signal

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• Non-gaussianity in the foreground-reduced CMB maps
• North-South non-Gaussian asymmetry in PLANCK CMB maps
• Auto and cross correlation of phases of the whole-sky CMB and foreground maps from the 1-year WMAP data
• The One-dimensional Fourier Representation and Large Angular Scale Foreground Contamination in the 3-year Wilkinson Microwave Anisotropy Probe data
• Searching for primordial non-Gaussianity in Planck CMB maps using a combined estimator
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• On the Coherence of WMAP and Planck Temperature Maps
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• Cross-correlation analysis of CMB with foregrounds for residuals
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