A Faraday Rotation Template for the Galactic Sky

Details A Faraday Rotation Template for the Galactic Sky A Faraday Rotation Template for the Galactic Sky

2004-10-26

arxiv.org/abs/astro-ph/0410636v2

Mon.Not.Roy.Astron.Soc. 362 (2005) 403-410

Astronomy and Astrophysics

Astrophysics

9 pages, 9 figures, accepted for publication in MNRAS

Scientific paper

10.1111/j.1365-2966.2005.09331.x

Using a set of compilations of measurements for extragalactic radio sources we construct all-sky maps of the Faraday Rotation produced by the Galactic magnetic field. In order to generate the maps we treat the radio source positions as a kind of "mask" and construct combinations of spherical harmonic modes that are orthogonal on the masked sky. As long as relatively small multipoles are used the resulting maps are quite stable to changes in selection criteria for the sources, and show clearly the structure of the local Galactic magnetic field. We also suggest the use of these maps as templates for CMB foreground analysis, illustrating the idea with a cross-correlation analysis between the Wilkinson Microwave Anisotropy Probe (WMAP) data and our maps. We find a significant cross-correlation, indicating the presence of significant residual contamination.

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