Bandpass mismatch error for satellite CMB experiments II: Correcting for the spurious signal. (arXiv:1902.00569v1 [astro-ph.IM])
<a href="http://arxiv.org/find/astro-ph/1/au:+Banerji_R/0/1/0/all/0/1">Ranajoy Banerji</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Patanchon_G/0/1/0/all/0/1">Guillaume Patanchon</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Delabrouille_J/0/1/0/all/0/1">Jacques Delabrouille</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Hoang_D/0/1/0/all/0/1">Duc Thuong Hoang</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Matsumura_T/0/1/0/all/0/1">Tomotake Matsumura</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Ishino_H/0/1/0/all/0/1">Hirokazu Ishino</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Hazumi_M/0/1/0/all/0/1">Masashi Hazumi</a>
Future Cosmic Microwave Background (CMB) satellite missions aim to use the
B-mode polarisation signal to measure the tensor-to-scalar ratio $r$ with a
sensitivity $sigma(r)$ of the order of $leq 10^{-3}$. 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.
Future Cosmic Microwave Background (CMB) satellite missions aim to use the
B-mode polarisation signal to measure the tensor-to-scalar ratio $r$ with a
sensitivity $sigma(r)$ of the order of $leq 10^{-3}$. 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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