An Improved Method for 21cm Foreground Removal
Author(s)
Liu, Adrian Chi-Yan; Tegmark, Max Erik; Bowman, Judd D.; Hewitt, Jacqueline N.; Zaldarriaga, Matias, 1971-
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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. We show that the new method reproduces the old one on large angular scales, and gives marked improvements on small scales at essentially no extra computational cost.
Date issued
2009-09Department
Massachusetts Institute of Technology. Department of Physics; MIT Kavli Institute for Astrophysics and Space ResearchJournal
Monthly Notices of the Royal Astronomical Society
Publisher
Oxford University Press
Citation
Liu, Adrian et al. “An Improved Method for 21-cm Foreground Removal.” Monthly Notices of the Royal Astronomical Society 398.1 (2009): 401–406.
Version: Author's final manuscript
ISSN
0035-8711
1365-8711