The large-scale polarization of the microwave foreground
| Autor: | Brian Keating, Peter Timbie, George Efstathiou, Angelica de Oliveira-Costa, George F. Smoot, Max Tegmark, Christopher W. O'Dell |
|---|---|
| Rok vydání: | 2003 |
| Předmět: |
Astrophysics::High Energy Astrophysical Phenomena
FOS: Physical sciences Synchrotron radiation Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics 01 natural sciences law.invention symbols.namesake law 0103 physical sciences Faraday effect 010303 astronomy & astrophysics Reionization Physics 010308 nuclear & particles physics Gravitational wave Astrophysics (astro-ph) Astronomy and Astrophysics Polarization (waves) CMB cold spot Synchrotron 13. Climate action Space and Planetary Science symbols Microwave |
| Zdroj: | New Astronomy Reviews. 47:1117-1121 |
| ISSN: | 1387-6473 |
| DOI: | 10.1016/j.newar.2003.09.012 |
| Popis: | 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. To be published in the proceedings of "The Cosmic Microwave Background and its Polarization", New Astronomy Reviews, (eds. S. Hanany and K.A. Olive). 4 pages. More foreground information at http://www.hep.upenn.edu/~angelica/foreground.html#polar or from angelica@higgs.hep.upenn.edu |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect