Bandpass mismatch error for satellite CMB experiments II: correcting for the spurious signal
Year: 2019
Type: article
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.
Authors: Ranajoy Banerji, Guillaume Patanchon, Jacques Delabrouille, Masashi Hazumi, Duc Thuong Hoang, Hirokazu Ishino, Tomotake Matsumura
Institutions: Centre National de la Recherche Scientifique, University of Oslo, Commissariat à l'Énergie Atomique et aux Énergies Alternatives, Observatoire de Paris, Laboratoire AstroParticule et Cosmologie, Sorbonne Paris Cité, Institut National de Physique Nucléaire et de Physique des Particules, Université Paris Diderot, CEA Paris-Saclay, High Energy Accelerator Research Organization, Kavli Institute for the Physics and Mathematics of the Universe, The Graduate University for Advanced Studies, SOKENDAI, Japan Aerospace Exploration Agency, Institute of Space and Astronautical Science, The University of Tokyo, Trường Đại học Khoa học và Công nghệ Hà Nội, Vietnam Academy of Science and Technology, Hanoi University of Science and Technology, Okayama University
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: bronze
Funders: National Energy Research Scientific Computing Center, Ministry of Education, Culture, Sports, Science and Technology, Centre National de la Recherche Scientifique, Norges Forskningsråd, Japan Society for the Promotion of Science, Institut National de Physique Nucléaire et de Physique des Particules
OpenAlex ID: W2913238182