QUBIC II: Spectro-Polarimetry with Bolometric Interferometry

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

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.