The Quest for Microwave Foreground X
| Autor: | Angelica de Oliveira-Costa, Carlos M. Gutiérrez, R. D. Davies, Max Tegmark, Anthony Lasenby, Robert A. Watson, Rafael Rebolo |
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| Rok vydání: | 2004 |
| Předmět: |
Physics
010308 nuclear & particles physics Spinning dust Astrophysics::High Energy Astrophysical Phenomena Astrophysics (astro-ph) Cosmic microwave background FOS: Physical sciences Synchrotron radiation Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics 01 natural sciences CMB cold spot Synchrotron law.invention Space and Planetary Science law 0103 physical sciences Physics::Accelerator Physics Anisotropy 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics Microwave Order of magnitude |
| Zdroj: | The Astrophysical Journal. 606:L89-L92 |
| ISSN: | 1538-4357 0004-637X |
| DOI: | 10.1086/421293 |
| Popis: | The WMAP team has produced a foreground map that can account for most of the low-frequency Galactic microwave emission in the WMAP maps, tentatively interpreting it as synchrotron emission. Finkbeiner and collaborators have challenged these conclusions, arguing that the WMAP team "synchrotron" template is in fact not dominated by synchrotron radiation, but by some dust-related Galactic emission process, perhaps spinning dust grains, making dramatically different predictions for its behavior at lower frequencies. By cross-correlating this "synchrotron" template with 10 and 15 GHz CMB observations, we find that its spectrum turns over in a manner consistent with spinning dust emission, falling about an order of magnitude below what the synchrotron interpretation would predict. Comment: 4 pages, 1 fig. Submitted to ApJ. Color figures and more foreground information at http://www.hep.upenn.edu/~angelica/foreground.html or from angelica@hep.upenn.edu |
| Databáze: | OpenAIRE |
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