In-flight polarization angle calibration for LiteBIRD: blind challenge and cosmological implications

Krachmalnicoff, N.; Matsumura, T.; de la Hoz, E.; Basak, S.; Gruppuso, A.; Minami, Y.; Baccigalupi, C.; Komatsu, E.; Martínez-González, E.; Vielva, P.; Aumont, J.; Aurlien, R.; Azzoni, S.; Banday, A. J.; Barreiro, R. B.; Bartolo, N.; Bersanelli, M.; Calabrese, E.; Carones, A.; Casas, F. J.; Cheung, K.; Chinone, Y.; Columbro, F.; de Bernardis, P.; Diego-Palazuelos, P.; Errard, J.; Finelli, F.; Fuskeland, U.; Galloway, M.; Genova-Santos, R. T.; Gerbino, M.; Ghigna, T.; Giardiello, S.; Gjerløw, E.; Hazumi, M.; Henrot-Versillé, S.; Kisner, T.; Lamagna, L.; Lattanzi, M.; Levrier, F.; Luzzi, G.; Maino, D.; Masi, S.; Migliaccio, M.; Montier, L.; Morgante, G.; Mot, B.; Nagata, R.; Nati, F.; Natoli, P.; Pagano, L.; Paiella, A.; Paoletti, D.; Patanchon, G.; Piacentini, F.; Polenta, G.; Poletti, D.; Puglisi, G.; Remazeilles, M.; Rubino-Martin, J.; Sasaki, M.; Shiraishi, M.; Signorelli, G.; Stever, S.; Tartari, A.; Tristram, M.; Tsuji, M.; Vacher, L.; Wehus, I. K.; Zannoni, M.; The LiteBIRD collaboration
Referencia bibliográfica

Journal of Cosmology and Astroparticle Physics

Fecha de publicación:
1
2022
Número de autores
71
Número de autores del IAC
2
Número de citas
19
Número de citas referidas
16
Descripción
We present a demonstration of the in-flight polarization angle calibration for the JAXA/ISAS second strategic large class mission, LiteBIRD, and estimate its impact on the measurement of the tensor-to-scalar ratio parameter, r, using simulated data. We generate a set of simulated sky maps with CMB and polarized foreground emission, and inject instrumental noise and polarization angle offsets to the 22 (partially overlapping) LiteBIRD frequency channels. Our in-flight angle calibration relies on nulling the EB cross correlation of the polarized signal in each channel. This calibration step has been carried out by two independent groups with a blind analysis, allowing an accuracy of the order of a few arc-minutes to be reached on the estimate of the angle offsets. Both the corrected and uncorrected multi-frequency maps are propagated through the foreground cleaning step, with the goal of computing clean CMB maps. We employ two component separation algorithms, the Bayesian-Separation of Components and Residuals Estimate Tool (B-SeCRET), and the Needlet Internal Linear Combination (NILC). We find that the recovered CMB maps obtained with algorithms that do not make any assumptions about the foreground properties, such as NILC, are only mildly affected by the angle miscalibration. However, polarization angle offsets strongly bias results obtained with the parametric fitting method. Once the miscalibration angles are corrected by EB nulling prior to the component separation, both component separation algorithms result in an unbiased estimation of the r parameter. While this work is motivated by the conceptual design study for LiteBIRD, its framework can be broadly applied to any CMB polarization experiment. In particular, the combination of simulation plus blind analysis provides a robust forecast by taking into account not only detector sensitivity but also systematic effects.
Proyectos relacionados
Mapa de todo el cielo mostrando la distribución espacial de las anisotropias primarias del Fondo Cósmico de Microondas (generadas sólo 380,000 años después del Big Bang) extraído de las observaciones del satélite Planck
Anisotropía del Fondo Cósmico de Microondas
El objetivo general de este proyecto es determinar y estudiar las variaciones espaciales y espectrales en la temperatura del Fondo Cósmico de Microondas y en su Polarización en un amplio rango de escalas angulares que van desde pocos minutos de arco hasta varios grados. Las fluctuaciones primordiales en la densidad de materia, que dieron origen a
Rafael
Rebolo López