Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-11-25
Mon.Not.Roy.Astron.Soc.373:139-145,2006
Astronomy and Astrophysics
Astrophysics
Scientific paper
10.1111/j.1365-2966.2006.11035.x
WMAP has provided CMB maps of the full sky. The raw data is subject to foreground contamination, in particular near to the Galactic plane. Foreground cleaned maps have been derived, e.g., the internal linear combination (ILC) map of Bennett et al. and the reduced foreground TOH map of Tegmark et al. Using S statistics we examine whether residual foreground contamination is left over in the foreground cleaned maps. In particular, we specify which parts of the foreground cleaned maps are sufficiently accurate for the circle-in-the-sky signature. We generalise the S statistic, called D statistic, such that the circle test can deal with CMB maps in which the contaminated regions of the sky are excluded with masks.
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