QUBIC II: Spectro-Polarimetry with Bolometric Interferometry

Abstract

Bolometric interferometry is a novel technique that has the ability to perform spectral imaging. A bolometric interferometer observes the sky in a wide frequency band and can reconstruct sky maps in several sub-bands within the physical band in post-processing of the data. This provides a powerful spectral method to discriminate between the cosmic microwave background (CMB) and astrophysical foregrounds. In this paper, the methodology is illustrated with examples based on the Q \& U Bolometric Interferometer for Cosmology (QUBIC) which is a ground-based instrument designed to measure the B-mode polarization of the sky at millimeter wavelengths. We consider the specific cases of point source reconstruction and Galactic dust mapping and we characterize the point spread function as a function of frequency. We study the noise properties of spectral imaging, especially the correlations between sub-bands, using end-to-end simulations together with a fast noise simulator. We conclude showing that spectral imaging performance are nearly optimal up to five sub-bands in the case of QUBIC.

arXiv comment27 pages, 18 figures. Accepted by JCAP on July 6, 2021. Second paper of series of 8 in a special JCAP edition on QUBIC

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• QUBIC I: Overview and ScienceProgram
• QUBIC V: Cryogenic system design and performance
• QUBIC VIII: Optical design and performance
• QUBIC III: Laboratory Characterization
• QUBIC VI: cryogenic half wave plate rotator, design and performances
• Enhancing CMB map reconstruction and power spectrum estimation with convolutional neural networks
• QUBIC VII: The feedhorn-switch system of the technological demonstrator
• Bias in the tensor-to-scalar ratio from self-interacting dark radiation
• Optimal method for reconstructing polychromatic maps from broadband observations with an asymmetric antenna pattern