Fingerprints of Galactic Loop I on the Cosmic Microwave Background

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We investigate possible imprints of galactic foreground structures such as the "radio loops" in the derived maps of the cosmic microwave background. Surprisingly, there is evidence for these not only at radio frequencies through their synchrotron radiation, but also at microwave frequencies where emission by dust dominates. This suggests the mechanism is magnetic dipole radiation from dust grains enriched by metallic iron or ferrimagnetic molecules. This new foreground we have identified is present at high galactic latitudes, and potentially dominates over the expected B-mode polarization signal due to primordial gravitational waves from inflation.
Original languageEnglish
JournalThe Astrophysical Journal Letters
Issue number2
Pages (from-to)L29
Number of pages5
Publication statusPublished - 10 Jul 2014

    Research areas

  • Faculty of Science - cosmic background radiation – cosmology: observations – polarization

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