Journal Article

Zonal modes of Cosmic Microwave Background temperature maps

Jo Short and Peter Coles

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 401, issue 4, pages 2202-2206
Published in print February 2010 | ISSN: 0035-8711
Published online January 2010 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2009.15833.x
Zonal modes of Cosmic Microwave Background temperature maps

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All-sky maps of the cosmic microwave background temperature fluctuations are usually represented by a spherical harmonic decomposition, involving modes labelled by their degree ℓ and order m (where −ℓ≤m≤+ℓ). The zonal modes (i.e. those with m= 0) are of particular interest because they vary only with galactic latitude; any anomalous behaviour in them might therefore be an indication of erroneous foreground substraction. We perform a simple statistical analysis of the modes with low ℓ for sky maps derived via different cleaning procedures from the Wilkinson Microwave Anisotropy Probe, and show that the zonal modes provide a useful diagnostic of possible systematics.

Keywords: methods: data analysis; cosmic microwave background; observations

Journal Article.  3790 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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