Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-12-19
Phys.Rev.D68:083003,2003
Astronomy and Astrophysics
Astrophysics
Typos fixed to match published version. 12 pages, 10 figs. More foreground info at http://www.hep.upenn.edu/~angelica/foregrou
Scientific paper
10.1103/PhysRevD.68.083003
The DASI discovery of CMB polarization has opened a new chapter in cosmology. 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 POLAR experiment, COBE/DMR and radio surveys to provide the strongest limits to date on the TE cross power spectrum of the CMB on large angular scales and to quantify the polarized synchrotron radiation, which is likely to be the most challenging polarized contaminant for the MAP 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 in the two-dimensional (l,nu)-plane and show that they cause the synchrotron polarization percentage to drop both towards lower frequencies and towards lower multipoles.
de Oliveira-Costa Angélica
Efstathiou George
Keating Brian
O'Dell Chris
Smoot George
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