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An Improved Method for 21cm Foreground Removal · Around

2009

An Improved Method for 21cm Foreground Removal

Liu, Adrian, Tegmark, Max, Bowman, Judd et al.

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Understand

21 cm tomography is expected to be difficult in part because of serious foreground contamination.

Previous studies have found that line-of-sight approaches are capable of cleaning foregrounds to an acceptable level on large spatial scales, but not on small spatial scales.
In this paper, we introduce a Fourier-space formalism for describing the line-of-sight methods, and use it to introduce an improved new method for 21 cm foreground cleaning.
Heuristically, this method involves fitting foregrounds in Fourier space using weighted polynomial fits, with each pixel weighted according to its information content.

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