Zonal Modes of Cosmic Microwave Background Temperature Maps

Details Zonal Modes of Cosmic Microwave Background Temperature Maps Zonal Modes of Cosmic Microwave Background Temperature Maps

2009-07-23

arxiv.org/abs/0907.4011v2

Mon.Not.Roy.Astron.Soc.401:2202-2206,2010

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

5 pages, 4 tables, 2 figures, accepted for publication in MNRAS

Scientific paper

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 (WMAP) and show that the zonal modes provide a useful diagnostic of possible systematics.

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