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arXiv:astro-ph/0702277 (astro-ph)
[Submitted on 9 Feb 2007 (v1), last revised 6 Sep 2007 (this version, v2)]

Title:Directionality in the WMAP Polarization Data

Authors:Duncan Hanson, Douglas Scott, Emory F. Bunn
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Abstract: Polarization is the next frontier of CMB analysis, but its signal is dominated over much of the sky by foregrounds which must be carefully removed. To determine the efficacy of this cleaning it is necessary to have sensitive tests for residual foreground contamination in polarization sky maps. The dominant Galactic foregrounds introduce a large-scale anisotropy on to the sky, so it makes sense to use a statistic sensitive to overall directionality for this purpose. Here we adapt the rapidly computable D statistic of Bunn and Scott to polarization data, and demonstrate its utility as a foreground monitor by applying it to the low resolution WMAP 3-yr sky maps. With a thorough simulation of the maps' noise properties, we find no evidence for contamination in the foreground cleaned sky maps.
Comments: 5 pages, modified to match version accepted by MNRAS
Subjects: Astrophysics (astro-ph)
Cite as: arXiv:astro-ph/0702277
  (or arXiv:astro-ph/0702277v2 for this version)
  https://doi.org/10.48550/arXiv.astro-ph/0702277

Submission history

From: Douglas Scott [view email]
[v1] Fri, 9 Feb 2007 23:08:49 UTC (187 KB)
[v2] Thu, 6 Sep 2007 08:23:56 UTC (189 KB)
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