Ade, P. A. R. ![]() |
Abstract
We use a custom-made calibrator to measure individual detectors’ polarization angles of BICEP3, a small aperture telescope observing the cosmic microwave background (CMB) at 95 GHz from the South Pole. We describe our calibration strategy and the statistical and systematic uncertainties associated with the measurement. We reach an unprecedented precision for such measurement on a CMB experiment, with a repeatability for each detector pair of 0.02°. We show that the relative angles measured using this method are in excellent agreement with those extracted from CMB data. Because the absolute measurement is currently limited by a systematic uncertainty, we do not derive cosmic birefringence constraints from BICEP3 data in this work. Rather, we forecast the sensitivity of BICEP3 sky maps for such analysis. We investigate the relative contributions of instrument noise, lensing, and dust, as well as astrophysical and instrumental systematics.
Item Type: | Article |
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Date Type: | Published Online |
Status: | Published |
Schools: | Schools > Physics and Astronomy |
Additional Information: | See link to publisher's page for full abstract. |
Publisher: | American Physical Society |
ISSN: | 2470-0010 |
Date of Acceptance: | 28 January 2025 |
Last Modified: | 24 Mar 2025 09:15 |
URI: | https://orca.cardiff.ac.uk/id/eprint/176912 |
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