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Observing cosmic microwave background polarization through ice

Pietranera, Luca, Buehler, Stefan A., Calisse, Paolo Gherardo, Emde, Claudia, Hayton, Darren John, John, Viju Oommen, Maffei, Bruno, Piccirillo, Lucio, Pisano, Giampaolo, Savini, Giorgio and Sreerekha, T. R. 2007. Observing cosmic microwave background polarization through ice. Monthly Notices of the Royal Astronomical Society 376 (2) , pp. 645-650. 10.1111/j.1365-2966.2007.11464.x

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Ice crystal clouds in the upper troposphere can generate polarization signals at the μK level. This signal can seriously affect very sensitive ground-based searches for E and B modes of cosmic microwave background polarization. In this paper, we estimate this effect within the CℓOVER experiment observing bands (97, 150 and 220 GHz) for the selected observing site (Llano de Chajnantor, Atacama desert, Chile). The results show that the polarization signal from the clouds can be of the order of or even bigger than the cosmic microwave background expected polarization. Climatological data suggest that this signal is fairly constant over the whole year in Antarctica. On the other hand, the stronger seasonal variability in Atacama allows for a 50 per cent of clean observations during the dry season.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Uncontrolled Keywords: Atmospheric effects; techniques: polarimetric; cosmic microwave background; cosmology: observations.
Publisher: Oxford University Press
ISSN: 0035-8711
Last Modified: 18 Jan 2018 20:43

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