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arxiv: 1907.06440 · v1 · pith:XVY3MPIWnew · submitted 2019-07-15 · 🌌 astro-ph.IM

A Roadmap for Astrophysics and Cosmology with High-Redshift 21 cm Intensity Mapping

The Hydrogen Epoch of Reionization Array (HERA) Collaboration , James E. Aguirre , Adam P. Beardsley , Gianni Bernardi , Judd D. Bowman , Philip Bull , Chris L. Carilli , Wei-Ming Dai
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David R. DeBoer Joshua S. Dillon Aaron Ewall-Wice Steve R. Furlanetto Bharat K. Gehlot Deepthi Gorthi Bradley Greig Bryna J. Hazelton Jacqueline N. Hewitt Daniel C. Jacobs Nicholas S. Kern Piyanat Kittiwisit Matthew Kolopanis Paul La Plante Adrian Liu Yin-Zhe Ma Mthokozisi Mdlalose Jordan Mirocha Steven G. Murray Aaron R. Parsons Jonathan C. Pober Peter H. Sims Nithyanandan Thyagarajan
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Pith reviewed 2026-05-24 21:20 UTC · model grok-4.3

classification 🌌 astro-ph.IM
keywords 21 cm cosmologyreionizationintensity mappingsystematicsroadmapHERAAstro2020high-redshift
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The pith

A coordinated program of small-scale instrumentation, software, and analysis projects will overcome current systematics and enable next-generation mid-scale 21 cm arrays to be proposed late in the decade.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper presents a US roadmap for high-redshift 21 cm cosmology spanning 2020 to 2030, starting from the funded HERA and MWA Phase II projects. It advances through targeted small-scale efforts that incorporate the best current knowledge of systematics to clear technical barriers. A sympathetic reader would care because this sequence positions the field to propose and build larger instruments capable of mapping the epoch of reionization and the first luminous structures. The roadmap treats these incremental projects as the necessary stepping stones rather than a single leap to big facilities.

Core claim

By folding the community's present understanding of foregrounds, calibration, and other systematics into a deliberate sequence of small instrumentation, software, and analysis projects, the field can resolve those obstacles and reach the point where mid-scale 21 cm arrays can be proposed late in the decade.

What carries the argument

The phased roadmap that begins with existing arrays and uses coordinated small-scale projects to mitigate systematics before scaling up.

If this is right

  • Next-generation mid-scale 21 cm arrays can be proposed and built late in the decade.
  • High-redshift intensity mapping becomes available as a practical tool for astrophysics and cosmology studies.
  • Funded projects such as HERA and MWA Phase II function as the foundation and testbed for the subsequent development steps.
  • Incremental advances in instrumentation and analysis directly translate into reduced systematics for the larger arrays.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • Success on this path could supply a template for staged development of other intensity-mapping experiments at different wavelengths.
  • If one small project reveals an unforeseen systematic, the entire timeline for mid-scale arrays would likely slip beyond the 2020s.
  • The roadmap implicitly assumes that lessons from these projects will generalize across different array designs rather than remaining instrument-specific.
  • International partners could adopt parallel small-project sequences to coordinate global 21 cm efforts.

Load-bearing premise

The community's current best understanding of the systematics is sufficiently complete and accurate to serve as a reliable basis for the proposed technology development path.

What would settle it

An experiment showing that a major systematic such as foreground removal or calibration cannot be controlled to the precision required even after the recommended small-scale projects would falsify the roadmap's premise.

Figures

Figures reproduced from arXiv: 1907.06440 by Aaron Ewall-Wice, Aaron R. Parsons, Adam P. Beardsley, Adrian Liu, Bharat K. Gehlot, Bradley Greig, Bryna J. Hazelton, Chris L. Carilli, Daniel C. Jacobs, David R. DeBoer, Deepthi Gorthi, Gianni Bernardi, Jacqueline N. Hewitt, James E. Aguirre, Jonathan C. Pober, Jordan Mirocha, Joshua S. Dillon, Judd D. Bowman, Matthew Kolopanis, Mthokozisi Mdlalose, Nicholas S. Kern, Nithyanandan Thyagarajan, Paul La Plante, Peter H. Sims, Philip Bull, Piyanat Kittiwisit, Steven G. Murray, Steve R. Furlanetto, The Hydrogen Epoch of Reionization Array (HERA) Collaboration, Wei-Ming Dai, Yin-Zhe Ma.

Figure 1
Figure 1. Figure 1: Schematic timeline of the Universe highlighting the as-yet unexplored Cosmic Dawn—the period from the first stars through the epoch of reionization. Figured adapted from [16]. To realize 21 cm cosmology’s tremendous potential, we focus on four progressively more challenging observational goals for the next decade: 1. detect the 21 cm power spectrum from the EoR and tightly constrain EoR models; 2. investig… view at source ↗
Figure 2
Figure 2. Figure 2: HERA, a second-generation 21 cm array under construction in South Africa, was designed for robust systematics mitigation to enable a >20σ detection of a fiducial EoR power spectrum ( [PITH_FULL_IMAGE:figures/full_fig_p003_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: The 2010s saw marked progress toward a detection of a fiducial (i.e. consistent with other constraints [34]) 21 cm power spectrum by first generation instruments [35; 36; 37; 38; 39; 40; 41; 42; 43; 44], enabled by both instrument build-out, and advances in calibration and foreground mitigation. manifest in signal loss and erroneously low power spectra have prompted re-analyses and revised limits [35; 43].… view at source ↗
Figure 4
Figure 4. Figure 4 [PITH_FULL_IMAGE:figures/full_fig_p004_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: Left: a noise-free simulated 21 cm image cube at z = 7.5 to 8.5 (z-axis is the line-of-sight) with contours for neutral (black) and ionized (white) regions. Center: the same cube with HERA noise, PSF, and foreground filtering up to the horizon line ( [PITH_FULL_IMAGE:figures/full_fig_p006_5.png] view at source ↗
Figure 6
Figure 6. Figure 6: Fiducial timeline for the 2020s. Purple (HERA) and brown (MWA) indicate currently funded arrays. New initiatives are in green, solid outlines denote a fiducial plan. Key decision points (yellow) require critical assessment of progress with HERA (1) and of the retirement of technical risk for next-generation arrays (2), like an EoR Imager or a Cosmic Dawn Array, through the milestones in §3. time calibratio… view at source ↗
read the original abstract

In this white paper, we lay out a US roadmap for high-redshift 21 cm cosmology (30 < z < 6) in the 2020s. Beginning with the currently-funded HERA and MWA Phase II projects and advancing through the decade with a coordinated program of small-scale instrumentation, software, and analysis projects targeting technology development, this roadmap incorporates our current best understanding of the systematics confronting 21 cm cosmology into a plan for overcoming them, enabling next-generation, mid-scale 21 cm arrays to be proposed late in the decade. Submitted for consideration by the Astro2020 Decadal Survey Program Panel for Radio, Millimeter, and Submillimeter Observations from the Ground as a Medium-Sized Project.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

0 major / 2 minor

Summary. The manuscript is a white paper that lays out a US roadmap for high-redshift 21 cm cosmology (30 < z < 6) during the 2020s. It begins with the currently funded HERA and MWA Phase II projects and advances via a coordinated sequence of small-scale instrumentation, software, and analysis projects that target known systematics, with the goal of enabling proposals for next-generation mid-scale 21 cm arrays late in the decade. The document is submitted to the Astro2020 Decadal Survey Program Panel for Radio, Millimeter, and Submillimeter Observations from the Ground as a Medium-Sized Project.

Significance. If adopted, the roadmap would provide a concrete, phased plan that incorporates the community's current understanding of 21 cm systematics into prioritized technology-development steps. Its value lies in the explicit linkage between near-term small projects and the readiness of mid-scale arrays, offering a practical path for the field rather than new empirical or theoretical results.

minor comments (2)
  1. [Abstract] The parenthetical redshift range in the abstract and title is written as (30 < z < 6); while conventional in the field, a brief clarifying clause (e.g., “spanning z = 6 to z = 30”) would remove any potential for misreading.
  2. The manuscript contains no equations, tables, or figures; if any illustrative timeline or project matrix is added in revision, ensure it is referenced in the main text.

Simulated Author's Rebuttal

0 responses · 0 unresolved

We thank the referee for their positive assessment and recommendation to accept the manuscript. The report contains no major comments.

Circularity Check

0 steps flagged

No significant circularity

full rationale

This is a planning roadmap white paper proposing a sequence of instrumentation and analysis projects. It contains no equations, derivations, quantitative predictions, fitted parameters, or uniqueness theorems. The central assertion is a proposed technology development path based on existing community understanding of systematics; no step reduces by construction to its own inputs or to a self-citation chain. The document is self-contained as a forward-looking plan and receives the default non-finding.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

No mathematical content, free parameters, or new entities are introduced; the document rests on standard domain knowledge of 21 cm systematics and existing instrument capabilities.

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Works this paper leans on

116 extracted references · 116 canonical work pages · 11 internal anchors

  1. [1]

    Astro2020 Science White Paper: Insights Into the Epoch of Reionization with the Highly-Redshifted 21-cm Line

    Steven Furlanetto, Chris L. Carilli, Jordan Mirocha, et al. Astro2020 Science White Paper: In- sights Into the Epoch of Reionization with the Highly-Redshifted 21-cm Line. arXiv e-prints , page arXiv:1903.06204, Mar 2019

    work page internal anchor Pith review Pith/arXiv arXiv 1903

  2. [2]

    Astro2020 Science White Paper: First Stars and Black Holes at Cosmic Dawn with Redshifted 21-cm Observations

    Jordan Mirocha, Daniel Jacobs, Josh Dillon, et al. Astro2020 Science White Paper: First Stars and Black Holes at Cosmic Dawn with Redshifted 21-cm Observations. arXiv e-prints , page arXiv:1903.06218, Mar 2019

    work page internal anchor Pith review Pith/arXiv arXiv 1903

  3. [3]

    Tomography of the Cosmic Dawn and Reionization Eras with Multiple Tracers

    Tzu-Ching Chang, Angus Beane, Olivier Dore, et al. Tomography of the Cosmic Dawn and Reionization Eras with Multiple Tracers. In BAAS, volume 51, page 282, May 2019

    work page 2019

  4. [4]

    Breysse, Adam Lidz, et al

    Ely Kovetz, Patrick C. Breysse, Adam Lidz, et al. Astrophysics and Cosmology with Line-Intensity Mapping. In BAAS, volume 51, page 101, May 2019

    work page 2019

  5. [5]

    Basu-Zych, A

    A. Basu-Zych, A. Mesinger, B. Greig, et al. Cooking with X-rays: Can X-ray binaries heat the early Universe? In Bulletin of the American Astronomical Society , volume 51 of BAAS, page 70, May 2019

    work page 2019

  6. [6]

    Astro 2020 Science White Paper: Fundamental Cosmology in the Dark Ages with 21-cm Line Fluctuations

    Steven Furlanetto, Judd D. Bowman, Jordan Mirocha, et al. Astro 2020 Science White Paper: Fundamental Cosmology in the Dark Ages with 21-cm Line Fluctuations. arXiv e-prints , page arXiv:1903.06212, Mar 2019

    work page internal anchor Pith review Pith/arXiv arXiv 2020

  7. [7]

    Cosmology with the Highly Redshifted 21 cm Line

    Adrian Liu, James Aguirre, Yacine Ali-Haimoud, et al. Cosmology with the Highly Redshifted 21 cm Line. In BAAS, volume 51, page 63, May 2019

    work page 2019

  8. [8]

    Cosmological Probes of Dark Matter Inter- actions: The Next Decade

    Vera Gluscevic, Yacine Ali-Haimoud, Keith Bechtol, et al. Cosmological Probes of Dark Matter Inter- actions: The Next Decade. In BAAS, volume 51, page 134, May 2019

    work page 2019

  9. [9]

    Dark Cosmology: Investigating Dark Matter &amp; Exotic Physics in the Dark Ages using the Redshifted 21-cm Global Spectrum

    Jack Burns, Stuart Bale, Neil Bassett, et al. Dark Cosmology: Investigating Dark Matter &amp; Exotic Physics in the Dark Ages using the Redshifted 21-cm Global Spectrum. In BAAS, volume 51, page 6, May 2019

    work page 2019

  10. [10]

    Astro2020 Science White Paper: Synergies Between Galaxy Surveys and Reionization Measurements

    Steven Furlanetto, Adam Beardsley, Chris L. Carilli, et al. Astro2020 Science White Paper: Synergies Between Galaxy Surveys and Reionization Measurements. arXiv e-prints, page arXiv:1903.06197, Mar 2019

    work page internal anchor Pith review Pith/arXiv arXiv 1903

  11. [11]

    Mapping Cosmic Dawn and Reionization: Challenges and Synergies

    Marcelo A. Alvarez, Anastasia Fialkov, Paul La Plante, et al. Mapping Cosmic Dawn and Reionization: Challenges and Synergies. arXiv e-prints, page arXiv:1903.04580, Mar 2019

    work page internal anchor Pith review Pith/arXiv arXiv 1903

  12. [12]

    Cosmic Dawn and Reionization: Astro- physics in the Final Frontier

    Asantha Cooray, James Aguirre, Yacine Ali-Haimoud, et al. Cosmic Dawn and Reionization: Astro- physics in the Final Frontier. In BAAS, volume 51, page 48, May 2019

    work page 2019

  13. [13]

    Unveiling Cosmic Dawn: the synergetic role of space and ground-based telescopes

    Jean-Gabriel Cuby, Pascal Oesch, Asantha Cooray, et al. Unveiling Cosmic Dawn: the synergetic role of space and ground-based telescopes. In BAAS, volume 51, page 360, May 2019

    work page 2019

  14. [14]

    Davies, Joseph F

    George Becker, Anson D’Aloisio, Frederick B. Davies, Joseph F. Hennawi, and Robert A. Simcoe. Studying the Reionization Epoch with QSO Absorption Lines. In BAAS, volume 51, page 440, May 2019

    work page 2019

  15. [15]

    Astro2020 Science White Paper: A proposal to exploit galaxy-21cm synergies to shed light on the Epoch of Reionization

    Anne Hutter, Pratika Dayal, Sangeeta Malhotra, et al. Astro2020 Science White Paper: A proposal to exploit galaxy-21cm synergies to shed light on the Epoch of Reionization. arXiv e-prints , page arXiv:1903.03628, Mar 2019

    work page internal anchor Pith review Pith/arXiv arXiv 1903

  16. [16]

    The dark ages of the universe

    Abraham Loeb. The dark ages of the universe. Scientific American, 295 5:46–53, 2006

    work page 2006

  17. [17]

    J. D. Bowman, A. E. E. Rogers, R. A. Monsalve, T. J. Mozdzen, and N. Mahesh. An absorption profile centred at 78 megahertz in the sky-averaged spectrum. Nature, 555:67–70, March 2018. 2

    work page 2018

  18. [18]

    D. R. DeBoer, A. R. Parsons, J. E. Aguirre, et al. Hydrogen Epoch of Reionization Array (HERA). PASP, 129(4):045001, April 2017

    work page 2017

  19. [19]

    S. J. Tingay, R. Goeke, J. D. Bowman, et al. The Murchison Widefield Array: The Square Kilometre Array Precursor at Low Radio Frequencies. PASA, 30:7, January 2013

    work page 2013

  20. [20]

    J. D. Bowman, I. Cairns, D. L. Kaplan, et al. Science with the Murchison Widefield Array. PASA, 30:31, April 2013

    work page 2013

  21. [21]

    M. P. van Haarlem, M. W. Wise, A. W. Gunst, et al. LOFAR: The LOw-Frequency ARray. A&A, 556:A2, Aug 2013

    work page 2013

  22. [22]

    A. R. Parsons, D. C. Backer, G. S. Foster, et al. The Precision Array for Probing the Epoch of Re-ionization: Eight Station Results. AJ, 139:1468–1480, April 2010

    work page 2010

  23. [23]

    Aguirre, Judd D

    Donald Charles Backer, James E. Aguirre, Judd D. Bowman, et al. Hera - hydrogen epoch of reionization arrays. In Astro2010: The Astronomy and Astrophysics Decadal Survey , 2010

    work page 2010

  24. [24]

    J. C. Pober. The impact of foregrounds on redshift space distortion measurements with the highly redshifted 21-cm line. MNRAS, 447:1705–1712, February 2015

    work page 2015

  25. [25]

    Greig and A

    B. Greig and A. Mesinger. 21CMMC: an MCMC analysis tool enabling astrophysical parameter studies of the cosmic 21 cm signal. MNRAS, 449:4246–4263, June 2015

    work page 2015

  26. [26]

    R. Barkana. Possible interaction between baryons and dark-matter particles revealed by the first stars. Nature, 555:71–74, March 2018

    work page 2018

  27. [27]

    Mu˜ noz, Cora Dvorkin, and Abraham Loeb

    Julian B. Mu˜ noz, Cora Dvorkin, and Abraham Loeb. 21-cm Fluctuations from Charged Dark Matter. PhRvL, 121(12):121301, Sep 2018

    work page 2018

  28. [28]

    Greig and A

    B. Greig and A. Mesinger. Simultaneously constraining the astrophysics of reionization and the epoch of heating with 21CMMC. MNRAS, 472:2651–2669, December 2017

    work page 2017

  29. [29]

    N. S. Kern, A. Liu, A. R. Parsons, A. Mesinger, and B. Greig. Emulating Simulations of Cosmic Dawn for 21 cm Power Spectrum Constraints on Cosmology, Reionization, and X-Ray Heating. ApJ, 848:23, October 2017

    work page 2017

  30. [30]

    A. R. Neben, R. F. Bradley, J. N. Hewitt, et al. The Hydrogen Epoch of Reionization Array Dish. I. Beam Pattern Measurements and Science Implications. ApJ, 826:199, August 2016

    work page 2016

  31. [31]

    Patra, A

    N. Patra, A. R. Parsons, D. R. DeBoer, et al. The hydrogen epoch of reionization array dish III: measuring chromaticity of prototype element with reflectometry. Experimental Astronomy , March 2018

    work page 2018

  32. [32]

    S. A. Kohn, J. E. Aguirre, P. La Plante, et al. The HERA-19 Commissioning Array: Direction Depen- dent Effects. arXiv e-prints, February 2018

    work page 2018

  33. [33]

    C. L. Carilli, Bojan Nikolic, N. Thyagarayan, and K. Gale-Sides. H I 21-cm Cosmology and the Bispec- trum: Closure Diagnostics in Massively Redundant Interferometric Arrays. Radio Science, 53(5):845– 865, May 2018

    work page 2018

  34. [34]

    Mesinger, S

    A. Mesinger, S. Furlanetto, and R. Cen. 21CMFAST: a fast, seminumerical simulation of the high- redshift 21-cm signal. MNRAS, 411:955–972, February 2011

    work page 2011

  35. [35]

    Paciga, J

    G. Paciga, J. G. Albert, K. Bandura, et al. A simulation-calibrated limit on the H I power spectrum from the GMRT Epoch of Reionization experiment. MNRAS, May 2013

    work page 2013

  36. [36]

    J. S. Dillon, A. Liu, C. L. Williams, et al. Overcoming real-world obstacles in 21 cm power spectrum estimation: A method demonstration and results from early Murchison Widefield Array data. PhRvD, 89(2):023002, January 2014

    work page 2014

  37. [37]

    J. S. Dillon, A. R. Neben, J. N. Hewitt, et al. Empirical covariance modeling for 21 cm power spectrum estimation: A method demonstration and new limits from early Murchison Widefield Array 128-tile data. PhRvD, 91(12):123011, June 2015

    work page 2015

  38. [38]

    Ewall-Wice, Joshua S

    A. Ewall-Wice, Joshua S. Dillon, J. N. Hewitt, et al. First limits on the 21 cm power spectrum during the Epoch of X-ray heating. MNRAS, 460(4):4320–4347, Aug 2016. 3

    work page 2016

  39. [39]

    A. P. Beardsley, B. J. Hazelton, I. S. Sullivan, et al. First Season MWA EoR Power spectrum Results at Redshift 7. ApJ, 833:102, December 2016

    work page 2016

  40. [40]

    A. H. Patil, S. Yatawatta, L. V. E. Koopmans, et al. Upper Limits on the 21 cm Epoch of Reionization Power Spectrum from One Night with LOFAR. ApJ, 838:65, March 2017

    work page 2017

  41. [41]

    B. K. Gehlot, F. G. Mertens, L. V. E. Koopmans, et al. The first power spectrum limit on the 21-cm signal of neutral hydrogen during the Cosmic Dawn at z = 20− 25 from LOFAR. arXiv e-prints, page arXiv:1809.06661, Sep 2018

    work page internal anchor Pith review Pith/arXiv arXiv 2018

  42. [42]

    Eastwood, Marin M

    Michael W. Eastwood, Marin M. Anderson, Ryan M. Monroe, et al. The 21 cm Power Spectrum from the Cosmic Dawn: First Results from the OVRO-LWA. arXiv e-prints , page arXiv:1906.08943, Jun 2019

    work page arXiv 1906

  43. [43]

    Kolopanis, D

    M. Kolopanis, D. C. Jacobs, C. Cheng, et al. A simplified, lossless re-analysis of paper-64. ApJ submitted, May 2019

    work page 2019

  44. [44]

    Barry, M

    N. Barry, M. Wilensky, C. M. Trott, et al. Improving the EoR Power Spectrum Results from MWA Season 1 Observations. ApJ submitted, March 2019

    work page 2019

  45. [45]

    Datta, J

    A. Datta, J. D. Bowman, and C. L. Carilli. Bright Source Subtraction Requirements for Redshifted 21 cm Measurements. ApJ, 724:526–538, November 2010

    work page 2010

  46. [46]

    Vedantham, N

    H. Vedantham, N. Udaya Shankar, and R. Subrahmanyan. Imaging the Epoch of Reionization: Limi- tations from Foreground Confusion and Imaging Algorithms. ApJ, 745:176, February 2012

    work page 2012

  47. [47]

    Parsons, J

    A. Parsons, J. Pober, M. McQuinn, D. Jacobs, and J. Aguirre. A Sensitivity and Array-configuration Study for Measuring the Power Spectrum of 21 cm Emission from Reionization. ApJ, 753:81, July 2012

    work page 2012

  48. [48]

    A. R. Parsons, J. C. Pober, J. E. Aguirre, et al. A Per-baseline, Delay-spectrum Technique for Accessing the 21 cm Cosmic Reionization Signature. ApJ, 756:165, September 2012

    work page 2012

  49. [49]

    Barry, B

    N. Barry, B. Hazelton, I. Sullivan, M. F. Morales, and J. C. Pober. Calibration requirements for detecting the 21 cm epoch of reionization power spectrum and implications for the SKA. MNRAS, 461:3135–3144, September 2016

    work page 2016

  50. [50]

    Ewall-Wice, J

    A. Ewall-Wice, J. S. Dillon, A. Liu, and J. Hewitt. The impact of modelling errors on interferometer calibration for 21 cm power spectra. MNRAS, 470:1849–1870, September 2017

    work page 2017

  51. [51]

    Dillon, Aaron Ewall-Wice, Aaron R

    Naomi Orosz, Joshua S. Dillon, Aaron Ewall-Wice, Aaron R. Parsons, and Nithyanandan Thyagarajan. Mitigating the effects of antenna-to-antenna variation on redundant-baseline calibration for 21 cm cosmology. MNRAS, 487(1):537–549, Jul 2019

    work page 2019

  52. [52]

    W. et al. Li. in prep., 2019

    work page 2019

  53. [53]

    P. A. Carroll, J. Line, M. F. Morales, et al. A high reliability survey of discrete Epoch of Reionization foreground sources in the MWA EoR0 field. MNRAS, 461:4151–4175, October 2016

    work page 2016

  54. [54]

    Hurley-Walker, J

    N. Hurley-Walker, J. R. Callingham, P. J. Hancock, et al. GaLactic and Extragalactic All-sky Murchison Widefield Array (GLEAM) survey - I. A low-frequency extragalactic catalogue. MNRAS, 464:1146– 1167, January 2017

    work page 2017

  55. [55]

    T. W. Shimwell, C. Tasse, M. J. Hardcastle, et al. The LOFAR Two-metre Sky Survey. II. First data release. A&A, 622:A1, Feb 2019

    work page 2019

  56. [56]

    The FHD/$\boldsymbol{\varepsilon}$ppsilon Epoch of Reionization Power Spectrum Pipeline

    N. Barry, A. P. Beardsley, R. Byrne, et al. The FHD/ εppsilon Epoch of Reionization Power Spectrum Pipeline. arXiv e-prints, page arXiv:1901.02980, Jan 2019

    work page internal anchor Pith review Pith/arXiv arXiv 1901

  57. [57]

    A. Liu, M. Tegmark, S. Morrison, A. Lutomirski, and M. Zaldarriaga. Precision calibration of radio interferometers using redundant baselines. MNRAS, 408:1029–1050, October 2010

    work page 2010

  58. [58]

    Zheng, M

    H. Zheng, M. Tegmark, V. Buza, et al. MITEoR: a scalable interferometer for precision 21 cm cosmol- ogy. MNRAS, 445:1084–1103, December 2014

    work page 2014

  59. [59]

    Z. S. Ali, A. R. Parsons, H. Zheng, et al. PAPER-64 Constraints on Reionization: The 21 cm Power Spectrum at z = 8.4. ApJ, 809:61, August 2015

    work page 2015

  60. [60]

    J. S. Dillon, S. A. Kohn, A. R. Parsons, et al. Polarized redundant-baseline calibration for 21 cm cosmology without adding spectral structure. MNRAS, 477:5670–5681, July 2018. 4

    work page 2018

  61. [61]

    W. Li, J. C. Pober, B. J. Hazelton, et al. Comparing Redundant and Sky-model-based Interferometric Calibration: A First Look with Phase II of the MWA. ApJ, 863(2):170, Aug 2018

    work page 2018

  62. [62]

    Morales, Bryna Hazelton, et al

    Ruby Byrne, Miguel F. Morales, Bryna Hazelton, et al. Fundamental Limitations on the Calibration of Redundant 21 cm Cosmology Instruments and Implications for HERA and the SKA. ApJ, 875(1):70, Apr 2019

    work page 2019

  63. [63]

    Thyagarajan, A

    N. Thyagarajan, A. R. Parsons, D. R. DeBoer, et al. Effects of Antenna Beam Chromaticity on Redshifted 21 cm Power Spectrum and Implications for Hydrogen Epoch of Reionization Array. ApJ, 825:9, July 2016

    work page 2016

  64. [64]

    Fagnoni, E

    N. Fagnoni, E. de Lera Acedo, N. Razavi-Ghods, et al. Electrical and electromagnetic co-simulations of the HERA Phase I receiver system including the effects of mutual coupling, and impact on the EoR window detection. in prep, 2019

    work page 2019

  65. [65]

    Fagnoni, E

    N. Fagnoni, E. de Lera Acedo, N. Razavi-Ghods, et al. Design of a New Wideband Vivaldi Feed with Integrated Front-End Module for the HERA radio-telescope phase II. in prep, 2019

    work page 2019

  66. [66]

    I. S. Sullivan, M. F. Morales, B. J. Hazelton, et al. Fast Holographic Deconvolution: A New Technique for Precision Radio Interferometry. ApJ, 759:17, November 2012

    work page 2012

  67. [67]

    A. R. Parsons, A. Liu, J. E. Aguirre, et al. New Limits on 21 cm Epoch of Reionization from PAPER-32 Consistent with an X-Ray Heated Intergalactic Medium at z = 7.7. ApJ, 788:106, June 2014

    work page 2014

  68. [68]

    R. C. Jennison. A phase sensitive interferometer technique for the measurement of the Fourier trans- forms of spatial brightness distributions of small angular extent. MNRAS, 118:276–+, 1958

    work page 1958

  69. [69]

    Carilli, and Bojan Nikolic

    Nithyanandan Thyagarajan, Chris L. Carilli, and Bojan Nikolic. Detecting Cosmic Reionization Using the Bispectrum Phase. PhRvL, 120(25):251301, Jun 2018

    work page 2018

  70. [70]

    Ewall-Wice, R

    A. Ewall-Wice, R. Bradley, D. Deboer, et al. The Hydrogen Epoch of Reionization Array Dish. II. Characterization of Spectral Structure with Electromagnetic Simulations and Its Science Implications. ApJ, 831:196, November 2016

    work page 2016

  71. [71]

    Patra, A

    N. Patra, A. R. Parsons, D. R. DeBoer, et al. The hydrogen epoch of reionization array dish III: measuring chromaticity of prototype element with reflectometry. Experimental Astronomy, 45:177– 199, April 2018

    work page 2018

  72. [72]

    J. L. B. Line, B. McKinley, J. Rasti, et al. In situ measurement of MWA primary beam variation using ORBCOMM. PASA, 35:45, Dec 2018

    work page 2018

  73. [73]

    D. C. Jacobs, J. Burba, J. D. Bowman, et al. First Demonstration of ECHO: an External Calibrator for Hydrogen Observatories. PASP, 129(3):035002, March 2017

    work page 2017

  74. [74]

    Virone, P

    G. Virone, P. Bolli, F. Paonessa, et al. Strong mutual coupling effects on lofar: Modeling andin situvalidation. IEEE Transactions on Antennas and Propagation , 66(5):2581–2588, May 2018

    work page 2018

  75. [75]

    J. C. Pober, A. R. Parsons, D. C. Jacobs, et al. A Technique for Primary Beam Calibration of Drift- scanning, Wide-field Antenna Elements. AJ, 143:53, February 2012

    work page 2012

  76. [76]

    C. D. Nunhokee, A. R. Parsons, Z. Abdurashidova, et al. Constraining HERA’s in-situ beam pattern: A methodology and first result. in prep, 2019

    work page 2019

  77. [77]

    A. R. Neben, R. F. Bradley, J. N. Hewitt, et al. Measuring phased-array antenna beampatterns with high dynamic range for the Murchison Widefield Array using 137 MHz ORBCOMM satellites. Radio Science, 50:614–629, July 2015

    work page 2015

  78. [78]

    Tegmark and M

    M. Tegmark and M. Zaldarriaga. Fast Fourier transform telescope. PhRvD, 79(8):083530–+, April 2009

    work page 2009

  79. [79]

    Omniscopes: Large area telescope arrays with only NlogN computational cost

    Max Tegmark and Matias Zaldarriaga. Omniscopes: Large area telescope arrays with only NlogN computational cost. PhRvD, 82(10):103501, Nov 2010

    work page 2010

  80. [80]

    Miguel F. Morales. Enabling Next-Generation Dark Energy and Epoch of Reionization Radio Obser- vatories with the MOFF Correlator. PASP, 123(909):1265, Nov 2011. 5

    work page 2011

Showing first 80 references.