2008/03/31 by B. Gold, C. L. Bennett, Robert Hill +22 · 205 citations
Physics and Astronomy · #Anisotropy #Astronomy #Astrophysics #CMB cold spot #Cosmic microwave background #Cosmology and Gravitation Theories #Galactic plane #Galaxy #Markov chain Monte Carlo #Monte Carlo method #Optics #Particle physics theoretical and experimental studies #Physics #Planck #Radio Astronomy Observations and Technology #Sky #Statistics #Synchrotron #astro-ph
paper · pdf · doi:10.1088/0067-0049/180/2/265
published in The Astrophysical Journal Supplement Series 180(2), 265-282 (Institute of Physics) · accepted by ApJS, 49 pages, 4 tables, 21 figures. PS and PDF versions with high-resolution figures available at http://lambda.gsfc.nasa.gov/product/map/dr3/map_bibliography.cfm
arxiv created 2008/10/21 · openalex publication_date 2009/02/01 · arxiv updated 2010/04/06 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
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 χ 2 ν 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.