PAPER-64 CONSTRAINTS on REIONIZATION: The 21 cm POWER SPECTRUM at z = 8.4

Zaki S. Ali; Aaron R. Parsons; Haoxuan Zheng; Jonathan C. Pober; Adrian Liu; James E. Aguirre; Richard F. Bradley; Gianni Bernardi; Chris L. Carilli; Carina Cheng; David R. Deboer; Matthew R. Dexter; Jasper Grobbelaar; Jasper Horrell; Daniel Jacobs; Pat Klima; David H.E. Macmahon; Matthys Maree; David F. Moore; Nima Razavi; Irina I. Stefan; William P. Walbrugh; Andre Walker

doi:10.1088/0004-637X/809/1/61

PAPER-64 CONSTRAINTS on REIONIZATION: The 21 cm POWER SPECTRUM at z = 8.4

Zaki S. Ali, Aaron R. Parsons, Haoxuan Zheng, Jonathan C. Pober, Adrian Liu, James E. Aguirre, Richard F. Bradley, Gianni Bernardi, Chris L. Carilli, Carina Cheng, David R. Deboer, Matthew R. Dexter, Jasper Grobbelaar, Jasper Horrell, Daniel Jacobs, Pat Klima, David H.E. Macmahon, Matthys Maree, David F. Moore, Nima RazaviIrina I. Stefan, William P. Walbrugh, Andre Walker

Earth and Space Exploration, School of (SESE)

Research output: Contribution to journal › Article › peer-review

218 Scopus citations

Abstract

In this paper, we report new limits on 21 cm emission from cosmic reionization based on a 135 day observing campaign with a 64-element deployment of the Donald C. Backer Precision Array for Probing the Epoch of Reionization in South Africa. This work extends the work presented in Parsons et al. with more collecting area, a longer observing period, improved redundancy-based calibration, improved fringe-rate filtering, and updated power-spectral analysis using optimal quadratic estimators. The result is a new 2σ upper limit on Δ²(k) of (22.4 mK)² in the range < k < 0.5h Mpc^-1 at z = 8.4. This represents a three-fold improvement over the previous best upper limit. As we discuss in more depth in a forthcoming paper, this upper limit supports and extends previous evidence against extremely cold reionization scenarios. We conclude with a discussion of implications for future 21 cm reionization experiments, including the newly funded Hydrogen Epoch of Reionization Array.

Original language	English (US)
Article number	61
Journal	Astrophysical Journal
Volume	809
Issue number	1
DOIs	https://doi.org/10.1088/0004-637X/809/1/61
State	Published - Aug 10 2015

Keywords

cosmology: observations
dark ages, reionization, first stars
early universe
instrumentation: interferometers
intergalactic medium

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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Ali, Z. S., Parsons, A. R., Zheng, H., Pober, J. C., Liu, A., Aguirre, J. E., Bradley, R. F., Bernardi, G., Carilli, C. L., Cheng, C., Deboer, D. R., Dexter, M. R., Grobbelaar, J., Horrell, J., Jacobs, D., Klima, P., Macmahon, D. H. E., Maree, M., Moore, D. F., ... Walker, A. (2015). PAPER-64 CONSTRAINTS on REIONIZATION: The 21 cm POWER SPECTRUM at z = 8.4. Astrophysical Journal, 809(1), Article 61. https://doi.org/10.1088/0004-637X/809/1/61

Ali, ZS, Parsons, AR, Zheng, H, Pober, JC, Liu, A, Aguirre, JE, Bradley, RF, Bernardi, G, Carilli, CL, Cheng, C, Deboer, DR, Dexter, MR, Grobbelaar, J, Horrell, J, Jacobs, D, Klima, P, Macmahon, DHE, Maree, M, Moore, DF, Razavi, N, Stefan, II, Walbrugh, WP & Walker, A 2015, 'PAPER-64 CONSTRAINTS on REIONIZATION: The 21 cm POWER SPECTRUM at z = 8.4', Astrophysical Journal, vol. 809, no. 1, 61. https://doi.org/10.1088/0004-637X/809/1/61

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abstract = "In this paper, we report new limits on 21 cm emission from cosmic reionization based on a 135 day observing campaign with a 64-element deployment of the Donald C. Backer Precision Array for Probing the Epoch of Reionization in South Africa. This work extends the work presented in Parsons et al. with more collecting area, a longer observing period, improved redundancy-based calibration, improved fringe-rate filtering, and updated power-spectral analysis using optimal quadratic estimators. The result is a new 2σ upper limit on Δ2(k) of (22.4 mK)2 in the range < k < 0.5h Mpc-1 at z = 8.4. This represents a three-fold improvement over the previous best upper limit. As we discuss in more depth in a forthcoming paper, this upper limit supports and extends previous evidence against extremely cold reionization scenarios. We conclude with a discussion of implications for future 21 cm reionization experiments, including the newly funded Hydrogen Epoch of Reionization Array.",

keywords = "cosmology: observations, dark ages, reionization, first stars, early universe, instrumentation: interferometers, intergalactic medium",

author = "Ali, {Zaki S.} and Parsons, {Aaron R.} and Haoxuan Zheng and Pober, {Jonathan C.} and Adrian Liu and Aguirre, {James E.} and Bradley, {Richard F.} and Gianni Bernardi and Carilli, {Chris L.} and Carina Cheng and Deboer, {David R.} and Dexter, {Matthew R.} and Jasper Grobbelaar and Jasper Horrell and Daniel Jacobs and Pat Klima and Macmahon, {David H.E.} and Matthys Maree and Moore, {David F.} and Nima Razavi and Stefan, {Irina I.} and Walbrugh, {William P.} and Andre Walker",

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doi = "10.1088/0004-637X/809/1/61",

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T2 - The 21 cm POWER SPECTRUM at z = 8.4

AU - Ali, Zaki S.

AU - Parsons, Aaron R.

AU - Zheng, Haoxuan

AU - Pober, Jonathan C.

AU - Liu, Adrian

AU - Aguirre, James E.

AU - Bradley, Richard F.

AU - Bernardi, Gianni

AU - Carilli, Chris L.

AU - Cheng, Carina

AU - Deboer, David R.

AU - Dexter, Matthew R.

AU - Grobbelaar, Jasper

AU - Horrell, Jasper

AU - Jacobs, Daniel

AU - Klima, Pat

AU - Macmahon, David H.E.

AU - Maree, Matthys

AU - Moore, David F.

AU - Razavi, Nima

AU - Stefan, Irina I.

AU - Walbrugh, William P.

AU - Walker, Andre

PY - 2015/8/10

Y1 - 2015/8/10

N2 - In this paper, we report new limits on 21 cm emission from cosmic reionization based on a 135 day observing campaign with a 64-element deployment of the Donald C. Backer Precision Array for Probing the Epoch of Reionization in South Africa. This work extends the work presented in Parsons et al. with more collecting area, a longer observing period, improved redundancy-based calibration, improved fringe-rate filtering, and updated power-spectral analysis using optimal quadratic estimators. The result is a new 2σ upper limit on Δ2(k) of (22.4 mK)2 in the range < k < 0.5h Mpc-1 at z = 8.4. This represents a three-fold improvement over the previous best upper limit. As we discuss in more depth in a forthcoming paper, this upper limit supports and extends previous evidence against extremely cold reionization scenarios. We conclude with a discussion of implications for future 21 cm reionization experiments, including the newly funded Hydrogen Epoch of Reionization Array.

AB - In this paper, we report new limits on 21 cm emission from cosmic reionization based on a 135 day observing campaign with a 64-element deployment of the Donald C. Backer Precision Array for Probing the Epoch of Reionization in South Africa. This work extends the work presented in Parsons et al. with more collecting area, a longer observing period, improved redundancy-based calibration, improved fringe-rate filtering, and updated power-spectral analysis using optimal quadratic estimators. The result is a new 2σ upper limit on Δ2(k) of (22.4 mK)2 in the range < k < 0.5h Mpc-1 at z = 8.4. This represents a three-fold improvement over the previous best upper limit. As we discuss in more depth in a forthcoming paper, this upper limit supports and extends previous evidence against extremely cold reionization scenarios. We conclude with a discussion of implications for future 21 cm reionization experiments, including the newly funded Hydrogen Epoch of Reionization Array.

KW - cosmology: observations

KW - dark ages, reionization, first stars

KW - early universe

KW - instrumentation: interferometers

KW - intergalactic medium

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PAPER-64 CONSTRAINTS on REIONIZATION: The 21 cm POWER SPECTRUM at z = 8.4

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