Publication

Reionization and cosmic dawn astrophysics from the Square Kilometre Array: impact of observing strategies

Greig, B., Mesinger, A. & Koopmans, L. V. E., Jan-2020, In : Monthly Notices of the Royal Astronomical Society. 491, 1, p. 1398-1407 10 p.

Research output: Contribution to journalArticleAcademicpeer-review

APA

Greig, B., Mesinger, A., & Koopmans, L. V. E. (2020). Reionization and cosmic dawn astrophysics from the Square Kilometre Array: impact of observing strategies. Monthly Notices of the Royal Astronomical Society, 491(1), 1398-1407. https://doi.org/10.1093/mnras/stz3138

Author

Greig, Bradley ; Mesinger, Andrei ; Koopmans, Leon V. E. / Reionization and cosmic dawn astrophysics from the Square Kilometre Array : impact of observing strategies. In: Monthly Notices of the Royal Astronomical Society. 2020 ; Vol. 491, No. 1. pp. 1398-1407.

Harvard

Greig, B, Mesinger, A & Koopmans, LVE 2020, 'Reionization and cosmic dawn astrophysics from the Square Kilometre Array: impact of observing strategies', Monthly Notices of the Royal Astronomical Society, vol. 491, no. 1, pp. 1398-1407. https://doi.org/10.1093/mnras/stz3138

Standard

Reionization and cosmic dawn astrophysics from the Square Kilometre Array : impact of observing strategies. / Greig, Bradley; Mesinger, Andrei; Koopmans, Leon V. E.

In: Monthly Notices of the Royal Astronomical Society, Vol. 491, No. 1, 01.2020, p. 1398-1407.

Research output: Contribution to journalArticleAcademicpeer-review

Vancouver

Greig B, Mesinger A, Koopmans LVE. Reionization and cosmic dawn astrophysics from the Square Kilometre Array: impact of observing strategies. Monthly Notices of the Royal Astronomical Society. 2020 Jan;491(1):1398-1407. https://doi.org/10.1093/mnras/stz3138


BibTeX

@article{22b6febb7bdc484babf5c7aeb485f29b,
title = "Reionization and cosmic dawn astrophysics from the Square Kilometre Array: impact of observing strategies",
abstract = "Interferometry of the cosmic 21-cm signal is set to revolutionize our understanding of the epoch of reionization (EoR) and the cosmic dawn (CD). The culmination of ongoing efforts will be the upcoming Square Kilometre Array (SKA), which will provide tomography of the 21-cm signal from the first billion years of our Universe. Using a galaxy formation model informed by high-z luminosity functions, here we forecast the accuracy with which the first phase of SKA-low (SKA1-low) can constrain the properties of the unseen galaxies driving the astrophysics of the EoR and CD. We consider three observing strategies: (i) deep (1000 h on a single field); (ii) medium-deep (100 h on 10 independent fields); and (iii) shallow (10 h on 100 independent fields). Using the 21-cm power spectrum as a summary statistic, and conservatively only using the 21-cm signal above the foreground wedge, we predict that all three observing strategies should recover astrophysical parameters to a fractional precision of similar to 0.1-10 per cent. The reionization history is recovered to an uncertainty of Delta z less than or similar to 0.1 (1 sigma) for the bulk of its duration. The medium-deep strategy, balancing thermal noise against cosmic variance, results in the tightest constraints, slightly outperforming the deep strategy. The shallow observational strategy performs theworst, with up to an similar to 10-60 per cent increase in the recovered uncertainty. We note, however, that non-Gaussian summary statistics, tomography, as well as unbiased foreground removal would likely favour the deep strategy.",
keywords = "galaxies: high-redshift, intergalactic medium, dark ages, reionization, first stars, diffuse radiation, early Universe, cosmology: theory, COSMOLOGICAL PARAMETER-ESTIMATION, HIGH-REDSHIFT, 21-CM SIGNAL, RADIATIVE FEEDBACK, GALAXY FORMATION, SIZE STATISTICS, NON-GAUSSIANITY, EPOCH, ABSORPTION, SIMULATIONS",
author = "Bradley Greig and Andrei Mesinger and Koopmans, {Leon V. E.}",
year = "2020",
month = jan,
doi = "10.1093/mnras/stz3138",
language = "English",
volume = "491",
pages = "1398--1407",
journal = "Monthly Notices of the Royal Astronomical Society",
issn = "0035-8711",
publisher = "Oxford University Press",
number = "1",

}

RIS

TY - JOUR

T1 - Reionization and cosmic dawn astrophysics from the Square Kilometre Array

T2 - impact of observing strategies

AU - Greig, Bradley

AU - Mesinger, Andrei

AU - Koopmans, Leon V. E.

PY - 2020/1

Y1 - 2020/1

N2 - Interferometry of the cosmic 21-cm signal is set to revolutionize our understanding of the epoch of reionization (EoR) and the cosmic dawn (CD). The culmination of ongoing efforts will be the upcoming Square Kilometre Array (SKA), which will provide tomography of the 21-cm signal from the first billion years of our Universe. Using a galaxy formation model informed by high-z luminosity functions, here we forecast the accuracy with which the first phase of SKA-low (SKA1-low) can constrain the properties of the unseen galaxies driving the astrophysics of the EoR and CD. We consider three observing strategies: (i) deep (1000 h on a single field); (ii) medium-deep (100 h on 10 independent fields); and (iii) shallow (10 h on 100 independent fields). Using the 21-cm power spectrum as a summary statistic, and conservatively only using the 21-cm signal above the foreground wedge, we predict that all three observing strategies should recover astrophysical parameters to a fractional precision of similar to 0.1-10 per cent. The reionization history is recovered to an uncertainty of Delta z less than or similar to 0.1 (1 sigma) for the bulk of its duration. The medium-deep strategy, balancing thermal noise against cosmic variance, results in the tightest constraints, slightly outperforming the deep strategy. The shallow observational strategy performs theworst, with up to an similar to 10-60 per cent increase in the recovered uncertainty. We note, however, that non-Gaussian summary statistics, tomography, as well as unbiased foreground removal would likely favour the deep strategy.

AB - Interferometry of the cosmic 21-cm signal is set to revolutionize our understanding of the epoch of reionization (EoR) and the cosmic dawn (CD). The culmination of ongoing efforts will be the upcoming Square Kilometre Array (SKA), which will provide tomography of the 21-cm signal from the first billion years of our Universe. Using a galaxy formation model informed by high-z luminosity functions, here we forecast the accuracy with which the first phase of SKA-low (SKA1-low) can constrain the properties of the unseen galaxies driving the astrophysics of the EoR and CD. We consider three observing strategies: (i) deep (1000 h on a single field); (ii) medium-deep (100 h on 10 independent fields); and (iii) shallow (10 h on 100 independent fields). Using the 21-cm power spectrum as a summary statistic, and conservatively only using the 21-cm signal above the foreground wedge, we predict that all three observing strategies should recover astrophysical parameters to a fractional precision of similar to 0.1-10 per cent. The reionization history is recovered to an uncertainty of Delta z less than or similar to 0.1 (1 sigma) for the bulk of its duration. The medium-deep strategy, balancing thermal noise against cosmic variance, results in the tightest constraints, slightly outperforming the deep strategy. The shallow observational strategy performs theworst, with up to an similar to 10-60 per cent increase in the recovered uncertainty. We note, however, that non-Gaussian summary statistics, tomography, as well as unbiased foreground removal would likely favour the deep strategy.

KW - galaxies: high-redshift

KW - intergalactic medium

KW - dark ages, reionization, first stars

KW - diffuse radiation

KW - early Universe

KW - cosmology: theory

KW - COSMOLOGICAL PARAMETER-ESTIMATION

KW - HIGH-REDSHIFT

KW - 21-CM SIGNAL

KW - RADIATIVE FEEDBACK

KW - GALAXY FORMATION

KW - SIZE STATISTICS

KW - NON-GAUSSIANITY

KW - EPOCH

KW - ABSORPTION

KW - SIMULATIONS

U2 - 10.1093/mnras/stz3138

DO - 10.1093/mnras/stz3138

M3 - Article

VL - 491

SP - 1398

EP - 1407

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

SN - 0035-8711

IS - 1

ER -

ID: 128653168