Bandpass mismatch error for satellite CMB experiments II: Correcting for the spurious signal

Ranajoy Banerji, Guillaume Patanchon, Jacques Delabrouille, Masashi Hazumi, Duc Thuong Hoang, Hirokazu Ishino, Tomotake Matsumura

Research output: Contribution to journalArticle

Abstract

Future Cosmic Microwave Background (CMB) satellite missions aim at using the B-mode polarisation signal to measure the tensor-to-scalar ratio r with a sensitivity σ(r) of the order of 10-2. Small uncertainties in the characterisation of instrument properties such as the spectral filters can lead to a leakage of the intensity signal to polarisation and can possibly bias any measurement of a primordial signal. In this paper we discuss methods for avoiding and correcting for the intensity to polarisation leakage due to bandpass mismatch among detector sets. We develop a template fitting map-maker to obtain an unbiased estimate of the leakage signal and subtract it out of the total signal. Using simulations we show how such a method can reduce the bias on the observed B-mode signal by up to 3 orders of magnitude in power.

Original languageEnglish
Article number043
JournalJournal of Cosmology and Astroparticle Physics
Volume2019
Issue number7
DOIs
Publication statusPublished - Jul 29 2019

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microwaves
leakage
polarization
templates
tensors
scalars
filters
sensitivity
detectors
estimates
simulation

Keywords

  • CMBR experiments
  • CMBR polarisation
  • inflation

ASJC Scopus subject areas

  • Astronomy and Astrophysics

Cite this

Bandpass mismatch error for satellite CMB experiments II : Correcting for the spurious signal. / Banerji, Ranajoy; Patanchon, Guillaume; Delabrouille, Jacques; Hazumi, Masashi; Hoang, Duc Thuong; Ishino, Hirokazu; Matsumura, Tomotake.

In: Journal of Cosmology and Astroparticle Physics, Vol. 2019, No. 7, 043, 29.07.2019.

Research output: Contribution to journalArticle

Banerji, Ranajoy ; Patanchon, Guillaume ; Delabrouille, Jacques ; Hazumi, Masashi ; Hoang, Duc Thuong ; Ishino, Hirokazu ; Matsumura, Tomotake. / Bandpass mismatch error for satellite CMB experiments II : Correcting for the spurious signal. In: Journal of Cosmology and Astroparticle Physics. 2019 ; Vol. 2019, No. 7.
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