CHIPS: The Cosmological H i Power Spectrum Estimator

© 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 th...

Full description

Bibliographic Details
Main 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.
Format:	Journal Article
Published:	Institute of Physics Publishing 2016
Online Access:	http://iopscience.iop.org/article/10.3847/0004-637X/818/2/139 http://hdl.handle.net/20.500.11937/19305

_version_	1848749995356848128
author	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.
author_facet	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.
author_sort	Trott, Cathryn
building	Curtin Institutional Repository
collection	Online Access
description	© 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.
first_indexed	2025-11-14T07:29:47Z
format	Journal Article
id	curtin-20.500.11937-19305
institution	Curtin University Malaysia
institution_category	Local University
last_indexed	2025-11-14T07:29:47Z
publishDate	2016
publisher	Institute of Physics Publishing
recordtype	eprints
repository_type	Digital Repository
spelling	curtin-20.500.11937-193052022-11-23T09:34:05Z 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. © 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. 2016 Journal Article http://hdl.handle.net/20.500.11937/19305 http://iopscience.iop.org/article/10.3847/0004-637X/818/2/139 http://purl.org/au-research/grants/arc/DE140100316 Institute of Physics Publishing fulltext
spellingShingle	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. CHIPS: The Cosmological H i Power Spectrum Estimator
title	CHIPS: The Cosmological H i Power Spectrum Estimator
title_full	CHIPS: The Cosmological H i Power Spectrum Estimator
title_fullStr	CHIPS: The Cosmological H i Power Spectrum Estimator
title_full_unstemmed	CHIPS: The Cosmological H i Power Spectrum Estimator
title_short	CHIPS: The Cosmological H i Power Spectrum Estimator
title_sort	chips: the cosmological h i power spectrum estimator
url	http://iopscience.iop.org/article/10.3847/0004-637X/818/2/139 http://iopscience.iop.org/article/10.3847/0004-637X/818/2/139 http://hdl.handle.net/20.500.11937/19305

CHIPS: The Cosmological H i Power Spectrum Estimator

Similar Items