The large-scale polarization of the microwave foreground |
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| Authors: | Anglica de Oliveira-Costa Max Tegmark Christopher O&#x;Dell Brian Keating Peter Timbie George Efstathiou George Smoot |
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| Institution: | Angélica de Oliveira-Costa, Max Tegmark, Christopher O’Dell, Brian Keating, Peter Timbie, George Efstathiou,George Smoot |
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| Abstract: | 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 408–820 MHz with a hint of E-domination at higher frequencies. We quantify Faraday rotation and 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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