CHIPS: The Cosmological H i Power Spectrum Estimator

Trott, Cathryn; Pindor, B.; Procopio, P.; Wayth, Randall; Mitchell, D.; McKinley, B.; Tingay, Steven; Barry, N.; Beardsley, A.; Bernardi, G.; Bowman, J.; Briggs, F.; Cappallo, R.; Carroll, P.; Oliveira-Costa, A.; Dillon, J.; Ewall-Wice, A.; Feng, L.; Greenhill, L.; Hazelton, B.; Hewitt, J.; Hurley-Walker, Natasha; Johnston-Hollitt, M.; Jacobs, D.; Kaplan, D.; Kim, H.; Lenc, E.; Line, J.; Loeb, A.; Lonsdale, C.; Morales, M.; Morgan, E.; Neben, A.; Thyagarajan, N.; Oberoi, D.; Offringa, A.; Ord, Stephen; Paul, S.; Pober, J.; Prabu, T.; Riding, J.; Shankar, N.; Sethi, S.; Srivani, K.; Subrahmanyan, R.; Sullivan, I.; Tegmark, M.; Webster, R.; Williams, Andrew; Williams, C.; Wu, C.; Wyithe, J.

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Access Status

Open access

Authors

Trott, Cathryn

Pindor, B.

Procopio, P.

Wayth, Randall

Mitchell, D.

McKinley, B.

Tingay, Steven

Barry, N.

Beardsley, A.

Bernardi, G.

Bowman, J.

Briggs, F.

Cappallo, R.

Carroll, P.

Oliveira-Costa, A.

Dillon, J.

Ewall-Wice, A.

Feng, L.

Greenhill, L.

Hazelton, B.

Hewitt, J.

Hurley-Walker, Natasha

Johnston-Hollitt, M.

Jacobs, D.

Kaplan, D.

Kim, H.

Lenc, E.

Line, J.

Loeb, A.

Lonsdale, C.

Morales, M.

Morgan, E.

Neben, A.

Thyagarajan, N.

Oberoi, D.

Offringa, A.

Ord, Stephen

Paul, S.

Pober, J.

Prabu, T.

Riding, J.

Shankar, N.

Sethi, S.

Srivani, K.

Subrahmanyan, R.

Sullivan, I.

Tegmark, M.

Webster, R.

Williams, Andrew

Williams, C.

Wu, C.

Wyithe, J.

Date

2016

Type

Journal Article

Metadata

Show full item record

Citation

Trott, C. and Pindor, B. and Procopio, P. and Wayth, R. and Mitchell, D. and McKinley, B. and Tingay, S. et al. 2016. CHIPS: The Cosmological H i Power Spectrum Estimator. Astrophysical Journal. 818 (2): 139.

Source Title

Astrophysical Journal

Additional URLs

http://iopscience.iop.org/article/10.3847/0004-637X/818/2/139

ISSN

0004-637X

School

Department of Electrical and Computer Engineering

Funding and Sponsorship

http://purl.org/au-research/grants/arc/DE140100316

Remarks

URI

http://hdl.handle.net/20.500.11937/19305

Collection

Curtin Research Publications

Abstract

© 2016. The American Astronomical Society. All rights reserved. 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 2s upper limit on the EoR dimensionless power at Mpc-1 of mK2 in the redshift range z = [6.2-6.6], consistent with previous estimates.