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Fingerprints of Galactic Loop I on the Cosmic Microwave Background

Publikation: Forskning - fagfællebedømtTidsskriftartikel

Dokumenter

Hao Liu, Philipp Mertsch, Subir Sarkar

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.
OriginalsprogEngelsk
TidsskriftThe Astrophysical Journal Letters
Vol/bind789
Tidsskriftsnummer2
Sider (fra-til)L29
Antal sider5
ISSN0004-637X
DOI
StatusUdgivet - 10 jul. 2014

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