Bandpass mismatch error for satellite CMB experiments I: estimating the spurious signal

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

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Future Cosmic Microwave Background (CMB) satellite missions aim to use the B mode polarization to measure the tensor-to-scalar ratio r with a sensitivity σr < 10 3. Achieving this goal will not only require sufficient detector array sensitivity but also unprecedented control of all systematic errors inherent in CMB polarization measurements. Since polarization measurements derive from differences between observations at different times and from different sensors, detector response mismatches introduce leakages from intensity to polarization and thus lead to a spurious B mode signal. Because the expected primordial B mode polarization signal is dwarfed by the known unpolarized intensity signal, such leakages could contribute substantially to the final error budget for measuring r. Using simulations we estimate the magnitude and angular spectrum of the spurious B mode signal resulting from bandpass mismatch between different detectors. It is assumed here that the detectors are calibrated, for example using the CMB dipole, so that their sensitivity to the primordial CMB signal has been perfectly matched. Consequently the mismatch in the frequency bandpass shape between detectors introduces differences in the relative calibration of galactic emission components. We simulate this effect using a range of scanning patterns being considered for future satellite missions. We find that the spurious contribution to r from the reionization bump on large angular scales ( < 10) is ≈ 10 3 assuming large detector arrays and 20 percent of the sky masked. We show how the amplitude of the leakage depends on the nonuniformity of the angular coverage in each pixel that results from the scan pattern.

Original languageEnglish
Article number015
JournalJournal of Cosmology and Astroparticle Physics
Volume2017
Issue number12
DOIs
Publication statusPublished - Dec 7 2017

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estimating
microwaves
detectors
polarization
leakage
sensitivity
systematic errors
nonuniformity
budgets
sky
pixels
tensors
dipoles
scalars
scanning
sensors
estimates
simulation

Keywords

  • CMBR experiments
  • CMBR polarisation

ASJC Scopus subject areas

  • Astronomy and Astrophysics

Cite this

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

In: Journal of Cosmology and Astroparticle Physics, Vol. 2017, No. 12, 015, 07.12.2017.

Research output: Contribution to journalArticle

Hoang, DT, Patanchon, G, Bucher, M, Matsumura, T, Banerji, R, Ishino, H, Hazumi, M & Delabrouille, J 2017, 'Bandpass mismatch error for satellite CMB experiments I: estimating the spurious signal', Journal of Cosmology and Astroparticle Physics, vol. 2017, no. 12, 015. https://doi.org/10.1088/1475-7516/2017/12/015
Hoang, Duc Thuong ; Patanchon, Guillaume ; Bucher, Martin ; Matsumura, Tomotake ; Banerji, Ranajoy ; Ishino, Hirokazu ; Hazumi, Masashi ; Delabrouille, Jacques. / Bandpass mismatch error for satellite CMB experiments I : estimating the spurious signal. In: Journal of Cosmology and Astroparticle Physics. 2017 ; Vol. 2017, No. 12.
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