Five-Year Wilkinson Microwave Anisotropy Probe Observations: Galactic Foreground Emission

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Gold, B.
Bennett, C. L.
Hill, R. S.
Hinshaw, G.
Odegard, N.
Page, L.
Spergel, D. N.
Weiland, J. L.
Dunkley, J.
Halpern, M.

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We present a new estimate of foreground emission in the Wilkinson Microwave Anisotropy Probe (WMAP) data, using a Markov chain Monte Carlo method. The new technique delivers maps of each foreground component for a variety of foreground models with estimates of the uncertainty of each foreground component, and it provides an overall goodness-of-fit estimate. The resulting foreground maps are in broad agreement with those from previous techniques used both within the collaboration and by other authors. We find that for WMAP data, a simple model with power-law synchrotron, free-free, and thermal dust components fits 90% of the sky with a reduced chi(2)(v) of 1.14. However, the model does not work well inside the Galactic plane. The addition of either synchrotron steepening or a modified spinning dust model improves the fit. This component may account for up to 14% of the total flux at the Ka band (33 GHz). We find no evidence for foreground contamination of the cosmic microwave background temperature map in the 85% of the sky used for cosmological analysis.



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Gold, B., C. L. Bennett, R. S. Hill, G. Hinshaw, N. Odegard, L. Page, D. N. Spergel et al. "Five-year wilkinson microwave anisotropy probe observations: galactic foreground emission." The Astrophysical Journal Supplement Series, Vol. 180, No. 2 (Feb., 2009): 265.