Journal
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
Volume 180, Issue 2, Pages 265-282Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0067-0049/180/2/265
Keywords
cosmic microwave background; cosmology: observations; diffuse radiation; Galaxy: halo; Galaxy: structure; ISM: structure
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Funding
- Science Mission Directorate Office at NASA Headquarters
- NASA [NNG05GE76G, NNX07AL75G S01, LTSA03-000-0090, ATPNNG04GK55G, ADP03-0000-092]
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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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