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2019

Reconstructing large-scale structure with neutral hydrogen surveys

Modi, Chirag, White, Martin, Slosar, Anze et al.

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Upcoming 21-cm intensity surveys will use the hyperfine transition in emission to map out neutral hydrogen in large volumes of the universe.

Unfortunately, large spatial scales are completely contaminated with spectrally smooth astrophysical foregrounds which are orders of magnitude brighter than the signal.
This contamination also leaks into smaller radial and angular modes to form a foreground wedge, further limiting the usefulness of 21-cm observations for different science cases, especially cross-correlations with tracers that have wide kernels in the radial direction.
In this paper, we investigate reconstructing these modes within a forward modeling framework.

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