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Communication Dans Un Congrès Année : 2024

The advantage of Bolometric Interferometry for controlling Galactic foreground contamination in CMB primordial B-modes measurements

E Manzan
  • Fonction : Auteur
A Mennella
  • Fonction : Auteur
L Zapelli
  • Fonction : Auteur
S Paradiso
  • Fonction : Auteur
E Battistelli
  • Fonction : Auteur
M Bersanelli
  • Fonction : Auteur
P de Bernardis
  • Fonction : Auteur
M de Petris
  • Fonction : Auteur
G d'Alessandro
  • Fonction : Auteur
M Gervasi
  • Fonction : Auteur
S Masi
  • Fonction : Auteur
E Rasztocky
  • Fonction : Auteur
G.E Romero
  • Fonction : Auteur
C.G Scoccola
  • Fonction : Auteur
M Zannoni
  • Fonction : Auteur

Résumé

In the quest for the faint primordial B-mode polarization of the Cosmic Microwave Background, three are the key requirements for any present or future experiment: an utmost sensitivity, excellent control over instrumental systematic effects and over Galactic foreground contamination. Bolometric Interferometry (BI) is a novel technique that matches them all by combining the sensitivity of bolometric detectors, the control of instrumental systematics from interferometry and a software-based, tunable, in-band spectral resolution due to its ability to perform band-splitting during data analysis (spectral imaging). In this paper, we investigate how the spectral imaging capability of BI can help in detecting residual contamination in case an over-simplified model of foreground emission is assumed in the analysis. To mimic this situation, we focus on the next generation of ground-based CMB experiment, CMB-S4, and compare its anticipated sensitivities, frequency and sky coverage with a hypothetical version of the same experiment based on BI, CMB-S4/BI, assuming that line-of-sight (LOS) frequency decorrelation is present in dust emission but is not accounted for during component separation. We show results from a Monte-Carlo analysis based on a parametric component separation method (FGBuster), highlighting how BI has the potential to diagnose the presence of foreground residuals in estimates of the tensor-to-scalar ratio $r$ in the case of unaccounted Galactic dust LOS frequency decorrelation.

Dates et versions

hal-04297215 , version 1 (21-11-2023)

Identifiants

Citer

E Manzan, M Regnier, J-Ch Hamilton, A Mennella, J Errard, et al.. The advantage of Bolometric Interferometry for controlling Galactic foreground contamination in CMB primordial B-modes measurements. mm Universe 2023, Jun 2023, Grenoble, France. pp.00029, ⟨10.1051/epjconf/202429300029⟩. ⟨hal-04297215⟩
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