The Large-Scale Polarization of the Microwave Foreground

Details The Large-Scale Polarization of the Microwave Foreground The Large-Scale Polarization of the Microwave Foreground

2003-05-29

arxiv.org/abs/astro-ph/0305590v1

Astronomy and Astrophysics

Astrophysics

To be published in the proceedings of "The Cosmic Microwave Background and its Polarization", New Astronomy Reviews, (eds. S.

Scientific paper

Most of the useful information about inflationary gravitational waves and reionization is on large angular scales where Galactic foreground contamination is the worst, so a key challenge is to model, quantify and remove polarized foregrounds. We use the Leiden radio surveys to quantify the polarized synchrotron radiation at large angular scales, which is likely to be the most challenging polarized contaminant for the WMAP satellite. We find that the synchrotron E- and B-contributions are equal to within 10% from 408-820MHz with a hint of E-domination at higher frequencies. We quantify Faraday Rotation & Depolarization effects and show that they cause the synchrotron polarization percentage to drop both towards lower frequencies and towards lower multipoles.

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