QUBIC II: Spectral polarimetry with bolometric interferometry

MOUSSET, L.; GAMBOA LERENA, M.M.; BATTISTELLI, E.S.; DE BERNARDIS, P.; CHANIAL, P.; D'ALESSANDRO, G.; DASHYAN, G.; DE PETRIS, M.; GRANDSIRE, L.; HAMILTON, J.-CH.; INCARDONA, F.; LANDAU, S.; MARNIEROS, S.; MASI, S.; MENNELLA, A.; O'SULLIVAN, C.; PIAT, M.; RICCIARDI, G.; SCÓCCOLA, C.G.; STOLPOVSKIY, M.; TARTARI, A.; THERMEAU, J.-P.; TORCHINSKY, S.A.; VOISIN, F.; ZANNONI, M.; ADE, P.; ALBERRO, J.G.; ALMELA, A.; AMICO, G.; ARNALDI, L.H.; AUGUSTE, D.; AUMONT, J.; AZZONI, S.; BANFI, S.; BAÙ, A.; BÉLIER, B.; BENNETT, D.; BERGÉ, L.; BERNARD, J.-PH.; BERSANELLI, M.; BIGOT-SAZY, M.-A.; BONAPARTE, J.; BONIS, J.; BUNN, E.; BURKE, D.; BUZI, D.; CAVALIERE, F.; CHAPRON, C.; CHARLASSIER, R.; COBOS CERUTTI, A.C.; COLUMBRO, F.; COPPOLECCHIA, A.; DE GASPERIS, G.; DE LEO, M.; DHEILLY, S.; DUCA, C.; DUMOULIN, L.; ETCHEGOYEN, A.; FASCISZEWSKI, A.; FERREYRO, L.P.; FRACCHIA, D.; FRANCESCHET, C.; GANGA, K.M.; GARCÍA, B.; GARCÍA REDONDO, M.E.; GASPARD, M.; GAYER, D.; GERVASI, M.; GIARD, M.; GILLES, V.; GIRAUD-HERAUD, Y.; GÓMEZ BERISSO

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS

IOP PUBLISHING LTD

Año: 2022 vol. 2022

1475-7516

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.