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.

Mousset, L., Gamboa Lerena, M., Battistelli, E., de Bernardis, P., Chanial, P., D'Alessandro, G., et al. (2022). QUBIC II: Spectral polarimetry with bolometric interferometry. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS, 2022(04) [10.1088/1475-7516/2022/04/035].

QUBIC II: Spectral polarimetry with bolometric interferometry

Zannoni, M.;Banfi, S.;Gervasi, M.;Nati, F.;Passerini, A.;
2022

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.
Articolo in rivista - Articolo scientifico
CMBR experiments; CMBR theory; cosmological parameters from CMBR; gravitational waves and CMBR polarization;
English
Mousset, L., Gamboa Lerena, M., Battistelli, E., de Bernardis, P., Chanial, P., D'Alessandro, G., et al. (2022). QUBIC II: Spectral polarimetry with bolometric interferometry. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS, 2022(04) [10.1088/1475-7516/2022/04/035].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/369885
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