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

Keywords

  • CMBR experiments
  • CMBR polarisation
  • inflation

ASJC Scopus subject areas

  • Astronomy and Astrophysics

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