A fast method for power spectrum and foreground analysis for 21 cm cosmology
Author(s)
Dillon, Joshua Shane; Liu, Adrian Chi-Yan; Tegmark, Max Erik
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We develop and demonstrate an acceleration of the Liu and Tegmark quadratic estimator formalism for inverse variance foreground subtraction and power spectrum estimation in 21 cm tomography from O(N[superscript 3]) to O(NlogN), where N is the number of voxels of data. This technique makes feasible the megavoxel scale analysis necessary for current and upcoming radio interferometers by making only moderately restrictive assumptions about foreground models and survey geometry. We exploit iterative and Monte Carlo techniques and the symmetries of the foreground covariance matrices to quickly estimate the 21 cm brightness temperature power spectrum, P(k[subscript ||],k[subscript ⊥]), the Fisher information matrix, the error bars, the window functions, and the bias. We also extend the Liu and Tegmark foreground model to include bright point sources with known positions in a way that scales as O[(NlogN)×(N point sources)]≤O(N[superscript 5]/[superscript 3]). As a first application of our method, we forecast error bars and window functions for the upcoming 128-tile deployment of the Murchinson Widefield Array, showing that 1000 hours of observation should prove sufficiently sensitive to detect the power spectrum signal from the Epoch of Reionization.
Date issued
2013-02Department
Massachusetts Institute of Technology. Department of Physics; MIT Kavli Institute for Astrophysics and Space ResearchJournal
Physical Review D
Publisher
American Physical Society
Citation
Dillon, Joshua S., Adrian Liu, and Max Tegmark. “A Fast Method for Power Spectrum and Foreground Analysis for 21 Cm Cosmology.” Physical Review D 87.4 (2013). © 2013 American Physical Society
Version: Final published version
ISSN
1550-7998
1089-4918