Fingerprints of Galactic Loop I on the Cosmic Microwave Background
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Fingerprints of Galactic Loop I on the Cosmic Microwave Background. / Liu, Hao; Mertsch, Philipp; Sarkar, Subir.
In: The Astrophysical Journal Letters, Vol. 789, No. 2, 10.07.2014, p. L29.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Fingerprints of Galactic Loop I on the Cosmic Microwave Background
AU - Liu, Hao
AU - Mertsch, Philipp
AU - Sarkar, Subir
PY - 2014/7/10
Y1 - 2014/7/10
N2 - 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.
AB - 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.
KW - Faculty of Science
KW - cosmic background radiation – cosmology: observations – polarization
U2 - 10.1088/2041-8205/789/2/L29
DO - 10.1088/2041-8205/789/2/L29
M3 - Journal article
VL - 789
SP - L29
JO - Astrophysical Journal
JF - Astrophysical Journal
SN - 0004-637X
IS - 2
ER -
ID: 129924563