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

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.
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https://hal.archives-ouvertes.fr/hal-02051542
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Submitted on : Wednesday, February 27, 2019 - 6:58:16 PM
Last modification on : Wednesday, August 14, 2019 - 9:23:43 AM

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Ranajoy Banerji, Guillaume Patanchon, Jacques Delabrouille, Masashi Hazumi, Duc Thuong Hoang, et al.. Bandpass mismatch error for satellite CMB experiments II: Correcting for the spurious signal. JCAP, 2020, 19 (07), pp.043. ⟨10.1088/1475-7516/2019/07/043⟩. ⟨hal-02051542⟩

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