An Improved Method for 21cm Foreground Removal
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Tegmark_AnImproved.pdf
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Author(s)
Liu, Adrian Chi-Yan
Tegmark, Max Erik
Bowman, Judd D.
Hewitt, Jacqueline N.
Zaldarriaga, Matias, 1971-
Date Issued
September 2009
Journal
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
Abstract
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.
MIT Department
Massachusetts Institute of Technology. Department of Physics
MIT Kavli Institute for Astrophysics and Space Research
Terms of Use
Creative Commons Attribution-Noncommercial-Share Alike 3.0
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DOI of Published Version
https://doi.org/10.1111/j.1365-2966.2009.15156.x
