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Precision of diffuse 21-cm lensing

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arxiv 0710.1108 v2 pith:UUKCXXPR submitted 2007-10-04 astro-ph

Tingting Lu (1) , Ue-Li Pen (2) ((1) Department of Astronomy , Astrophysics , University of Toronto , (2) CITA , University of Toronto) This is my paper · ORCID
classification astro-ph
keywords lensingweakaccuracydarkdiffusemappingmatterreconstruction
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We study the limits of accuracy for weak lensing maps of dark matter using diffuse 21-cm radiation from the pre-reionization epoch using simulations. We improve on previous "optimal" quadratic lensing estimators by using shear and convergence instead of deflection angles. We find that non-Gaussianity provides a limit to the accuracy of weak lensing reconstruction, even if instrumental noise is reduced to zero. The best reconstruction result is equivalent to Gaussian sources with effectively independent cell of side length 2.0/h Mpc. Using a source full map from z=10-20, this limiting sensitivity allows mapping of dark matter at a Signal-to-Noise ratio (S/N) greater than 1 out to l < 6000, which is better than any other proposed technique for large area weak lensing mapping.

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  1. Bias to CMB lensing from lensed foregrounds

    astro-ph.CO 2019-08 conditional novelty 7.0 of 10

    Lensed extragalactic foregrounds create a percent-level bias in CMB lensing estimators that is significant for upcoming Simons Observatory measurements and can be reduced by modified estimators.

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