Zonal modes of Cosmic Microwave Background temperature maps

Short, Joanna and Coles, Peter ORCID: https://orcid.org/0000-0002-5535-2850 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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Abstract

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:	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 2022 10:10
URI:	https://orca.cardiff.ac.uk/id/eprint/23457

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