Five-year wilkinson microwave anisotropy probe observations: Galactic foreground emission

B. Gold, C. L. Bennett, R. S. Hill, G. Hinshaw, N. Odegard, L. Page, D. N. Spergel, J. L. Weiland, J. Dunkley, M. Halpern, N. Jarosik, A. Kogut, E. Komatsu, D. Larson, S. S. Meyer, M. R. Nolta, E. Wollack, E. L. Wright

Research output: Contribution to journalArticle

171 Scopus citations

Abstract

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 χv2 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

Original languageEnglish (US)
Pages (from-to)265-282
Number of pages18
JournalAstrophysical Journal, Supplement Series
Volume180
Issue number2
DOIs
StatePublished - 2009

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Keywords

  • Cosmic microwave background
  • Cosmology: observations
  • Diffuse radiation
  • Galaxy: halo
  • Galaxy: structure
  • ISM: structure

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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., Jarosik, N., Kogut, A., Komatsu, E., Larson, D., Meyer, S. S., Nolta, M. R., Wollack, E., & Wright, E. L. (2009). Five-year wilkinson microwave anisotropy probe observations: Galactic foreground emission. Astrophysical Journal, Supplement Series, 180(2), 265-282. https://doi.org/10.1088/0067-0049/180/2/265