CHIPS: The COSMOLOGICAL H i POWER SPECTRUM ESTIMATOR
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Trott_2016_ApJ_818_139.pdf
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1.99 MB
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Author(s)
Trott, C. M.
Pindor, B.
Procopio, P.
Wayth, R. B.
Mitchell, D. A.
McKinley, B.
Tingay, S. J.
Barry, N.
Beardsley, A. P.
Bernardi, G.
Date Issued
February 2016
Journal
Astrophysical Journal
Publisher
IOP Publishing
Citation
Trott, C. M. et al. "CHIPS: The COSMOLOGICAL H i POWER SPECTRUM ESTIMATOR." The Astrophysical Journal 818 (February 2016): 139 © 2016 American Astronomical Society
Version
Final published version
Abstract
Detection of the cosmological neutral hydrogen signal from the Epoch of Reionization (EoR) and estimation of its basic physical parameters are principal scientific aims of many current low-frequency radio telescopes. Here we describe the Cosmological H i Power Spectrum Estimator (CHIPS), an algorithm developed and implemented with data from the Murchison Widefield Array, to compute the two-dimensional and spherically-averaged power spectrum of brightness temperature fluctuations. The principal motivations for CHIPS are the application of realistic instrumental and foreground models to form the optimal estimator, thereby maximizing the likelihood of unbiased signal estimation, and allowing a full covariant understanding of the outputs. CHIPS employs an inverse-covariance weighting of the data through the maximum likelihood estimator, thereby allowing use of the full parameter space for signal estimation ("foreground suppression"). We describe the motivation for the algorithm, implementation, application to real and simulated data, and early outputs. Upon application to a set of 3 hr of data, we set a 2σ upper limit on the EoR dimensionless power at k = 0.05h Mpc[superscript -1] of m[subscript K][superscript 2] < 7.6 x 10[superscript 4] mK[superscript 2] in the redshift range z = [6.2-6.6], consistent with previous estimates.
MIT Department
Massachusetts Institute of Technology. Department of Physics
MIT Kavli Institute for Astrophysics and Space Research
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DOI of Published Version
https://doi.org/10.3847/0004-637X/818/2/139
