Probability Density of the Multipole Vectors for a Gaussian Cosmic Microwave Background

Astronomy and Astrophysics – Astrophysics

Scientific paper

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12 pages, 7 figures, MNRAS style

Scientific paper

10.1111/j.1365-2966.2007.12484.x

We review Maxwell's multipole vectors, and elucidate some of their mathematical properties, with emphasis on the application of this tool to the cosmic microwave background (CMB). In particular, for a completely random function on the sphere (corresponding to the statistically isotropic Gaussian model of the CMB), we derive the full probability density function of the multipole vectors. This function is used to analyze the internal configurations of the third-year Wilkinson Microwave Anisotropy Probe quadrupole and octopole, and we show the observations are consistent with the Gaussian prediction. A particular aspect is the planarity of the octopole, which we find not to be anomalous.

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