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Zonal modes of Cosmic Microwave Background temperature maps

Short, Joanna and Coles, Peter 2010. Zonal modes of Cosmic Microwave Background temperature maps. Monthly Notices of the Royal Astronomical Society 401 (4) , pp. 2202-2206. 10.1111/j.1365-2966.2009.15833.x

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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.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Uncontrolled Keywords: methods: data analysis; cosmic microwave background; observations
Publisher: Wiley
ISSN: 0035-8711
Last Modified: 19 Oct 2019 03:43

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