QUBIC II: Spectro-Polarimetry with Bolometric Interferometry

BATTISTELLI, E.S.; D'ALESSANDRO, G.; GRANDSIRE, L.; LANDAU, S.; MENNELLA, A.; RICCIARDI, G.; TARTARI, A.; VOISIN, F.; ALBERRO, J.G.; ARNALDI, L.H.; AZZONI, S.; BÉLIER, B.; BERNARD, J.-PH.; BONAPARTE, J.; BURKE, D.; CHAPRON, C.; COLUMBRO, F.; DE LEO, M.; DUMOULIN, L.; FERREYRO, L.P.; GAMBOA LERENA, M.M.; GANGA, K.M.; CHANIAL, P.; GASPARD, M.; DE PETRIS, M.; GIARD, M.; INCARDONA, F.; GÓMEZ BERISSO, M.; MASI, S.; HAMPEL, M.R.; PIAT, M.; JULES, E.; LAMAGNA, L.; STOLPOVSKIY, M.; MAFFEI, B.; TORCHINSKY, S.A.; ADE, P.; MATTEI, A.; AMICO, G.; MELE, L.; MUNDO, L.M.; AUMONT, J.; NATI, F.; BAÙ, A.; PAIELLA, A.; BERGÉ, L.; PASTORIZA, H.; BIGOT-SAZY, M.-A.; PERCIBALLI, M.; BUNN, E.; PICCIRILLO, L.; CAVALIERE, F.; POLENTA, G.; COBOS CERUTTI, A.C.; RAMBAUD, D.; DE GASPERIS, G.; ROMERO, G.E.; DUCA, C.; SCULLY, S.; FASCISZEWSKI, A.; SUPANITSKY, A.D.; FRANCESCHET, C.; TUCKER, C.; GARCÍA REDONDO, M.E.; GERVASI, M.; VITTORIO, N.; GIRAUD-HERAUD, Y.; ZULLO, A.; GRADZIEL, M.; HENROT-VERSILLÉ, S.; KRISTUKAT, C.; LOUIS, T.; MARTY, W.

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS

IOP PUBLISHING LTD

Lugar: Londres; 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.