Deep multiredshift limits on Epoch of Reionization 21 cm power spectra from four seasons of Murchison Widefield Array observations

Abstract
We compute the spherically averaged power spectrum from four seasons of data obtained for the Epoch of Reionization (EoR) project observed with the Murchison Widefield Array (MWA). We measure the EoR power spectrum over k = 0.07–3.0 h Mpc−1 at redshifts $z$ = 6.5–8.7. The largest aggregation of 110 h on EoR0 high band (3340 observations), yields a lowest measurement of (43 mK)2 = 1.8 × 103 mK2 at k = 0.14 h Mpc−1 and $z$ = 6.5 (2σ thermal noise plus sample variance). Using the Real-Time System to calibrate and the CHIPS pipeline to estimate power spectra, we select the best observations from the central five pointings within the 2013–2016 observing seasons, observing three independent fields and in two frequency bands. This yields 13 591 2-min snapshots (453 h), based on a quality assurance metric that measures ionospheric activity. We perform another cut to remove poorly calibrated data, based on power in the foreground-dominated and EoR-dominated regions of the two-dimensional power spectrum, reducing the set to 12 569 observations (419 h). These data are processed in groups of 20 observations, to retain the capacity to identify poor data, and used to analyse the evolution and structure of the data over field, frequency, and data quality. We subsequently choose the cleanest 8935 observations (298 h of data) to form integrated power spectra over the different fields, pointings, and redshift ranges.

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References

Details

Published: Feb 12, 2020
Vol/Issue: 493(4)
Pages: 4711-4727
License: View

Authors

C

Cathryn M Trott

International Centre for Radio Astronomy Research (ICRAR), Curtin University, Bentley, WA, Australia; ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D), Bentley, Australia

C

C H Jordan

International Centre for Radio Astronomy Research (ICRAR), Curtin University, Bentley, WA, Australia; ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D), Bentley, Australia

S

S Midgley

DownUnder GeoSolutions Pty Ltd, West Perth, Australia

N

N Barry

ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D), Bentley, Australia; School of Physics, The University of Melbourne, Parkville, VIC 3010, Australia

B

B Greig

ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D), Bentley, Australia; School of Physics, The University of Melbourne, Parkville, VIC 3010, Australia

B

B Pindor

ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D), Bentley, Australia; School of Physics, The University of Melbourne, Parkville, VIC 3010, Australia

J

J H Cook

International Centre for Radio Astronomy Research (ICRAR), Curtin University, Bentley, WA, Australia

G

G Sleap

Curtin Institute of Radio Astronomy, GPO Box U1987, Perth, WA 6845, Australia

S

S J Tingay

International Centre for Radio Astronomy Research (ICRAR), Curtin University, Bentley, WA, Australia

D

D Ung

International Centre for Radio Astronomy Research (ICRAR), Curtin University, Bentley, WA, Australia

P

P Hancock

International Centre for Radio Astronomy Research (ICRAR), Curtin University, Bentley, WA, Australia

A

A WILLIAMS

Curtin Institute of Radio Astronomy, GPO Box U1987, Perth, WA 6845, Australia

J

J Bowman

School of Earth and Space Exploration, Arizona State University, Tempe, AZ, USA

R

R Byrne

Department of Physics, University of Washington, Seattle, WA 98195, USA

A

A Chokshi

ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D), Bentley, Australia; School of Physics, The University of Melbourne, Parkville, VIC 3010, Australia

B

B J Hazelton

Department of Physics, University of Washington, Seattle, WA 98195, USA; eScience Institute, University of Washington, Seattle, WA 98195, USA

K

K Hasegawa

Graduate School of Science, Nagoya University, Nagoya, Japan

D

D Jacobs

School of Earth and Space Exploration, Arizona State University, Tempe, AZ, USA

R

R C Joseph

International Centre for Radio Astronomy Research (ICRAR), Curtin University, Bentley, WA, Australia; ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D), Bentley, Australia

W

W Li

Shanghai Astronomical Observatory, Shanghai, China

J

J L B Line

International Centre for Radio Astronomy Research (ICRAR), Curtin University, Bentley, WA, Australia; ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D), Bentley, Australia

C

C Lynch

International Centre for Radio Astronomy Research (ICRAR), Curtin University, Bentley, WA, Australia; ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D), Bentley, Australia

B

B McKinley

International Centre for Radio Astronomy Research (ICRAR), Curtin University, Bentley, WA, Australia; ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D), Bentley, Australia

D

D A Mitchell

CSIRO Astronomy & Space Science, Australia Telescope National Facility, PO Box 76, Epping, NSW 1710, Australia

M

M F Morales

ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D), Bentley, Australia; Department of Physics, University of Washington, Seattle, WA 98195, USA

M

M Ouchi

Division of Science, National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan; Institute for Cosmic Ray Research, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8582, Japan; Kavli Institute for the Physics and Mathematics of the Universe (Kavli IPMU, WPI), The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8583, Japan

J

J C Pober

Department of Physics, Brown University, Providence, RI 02912, USA

M

M Rahimi

ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D), Bentley, Australia; School of Physics, The University of Melbourne, Parkville, VIC 3010, Australia

K

K Takahashi

Faculty of Advanced Science and Technology, Kumamoto University, Kumamoto, Japan; International Research Organization for Advanced Science and Technology, Kumamoto University, Kumamoto, Japan

R

R B Wayth

International Centre for Radio Astronomy Research (ICRAR), Curtin University, Bentley, WA, Australia; ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D), Bentley, Australia

R

R L Webster

ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D), Bentley, Australia; School of Physics, The University of Melbourne, Parkville, VIC 3010, Australia

M

M Wilensky

Department of Physics, University of Washington, Seattle, WA 98195, USA

J

J S B Wyithe

ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D), Bentley, Australia; School of Physics, The University of Melbourne, Parkville, VIC 3010, Australia

S

S Yoshiura

ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D), Bentley, Australia; School of Physics, The University of Melbourne, Parkville, VIC 3010, Australia

Z

Z. Zhang

Department of Physics, Brown University, Providence, RI 02912, USA

Q

Q Zheng

Shanghai Astronomical Observatory, Shanghai, China

Funding

Australian Research Council Award: LE160100031

ARC Award: FT180100321

JSPS Award: JP15H05896

Cite This Article

Cathryn M Trott, C H Jordan, S Midgley, et al. (2020). Deep multiredshift limits on Epoch of Reionization 21 cm power spectra from four seasons of Murchison Widefield Array observations. Monthly Notices of the Royal Astronomical Society, 493(4), 4711-4727. https://doi.org/10.1093/mnras/staa414

Deep multiredshift limits on Epoch of Reionization 21 cm power spectra from four seasons of Murchison Widefield Array observations

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