Removal of point source leakage from time-order data filtering by Zhaoxuan Zhang et al. on Sunday 27 November

Time-ordered data (TOD) from ground-based CMB experiments are generally

filtered before map-making to remove or reduce the contamination from the

ground and the atmospheric emissions. However, when the observation region

contains strong point sources, the filtering process will result in

considerable leakage around the point sources in a measured CMB map, and leave

spurious polarization signals. Therefore, such signals need to be assessed and

removed before CMB science exploitation. In this work, we present a new method

that we call "template fitting" and can effectively remove these leakage

signals in pixel domain, not only satisfying the requirement for measuring

primordial gravitational waves from CMB-$B$ modes, but also avoiding

time-consuming operations on TOD.

arXiv: http://arxiv.org/abs/http://arxiv.org/abs/2211.13870v1