# Optimal identification of H ii regions during reionization in 21-cm observations

@article{Giri2018OptimalIO,
title={Optimal identification of H ii regions during reionization in 21-cm observations},
author={Sambit K. Giri and Garrelt Mellema and Raghunath Ghara},
journal={Monthly Notices of the Royal Astronomical Society},
year={2018},
volume={479},
pages={5596-5611}
}
• Published 2018
• Physics
• Monthly Notices of the Royal Astronomical Society
The ability of the future low-frequency component of the Square Kilometre Array radio telescope to produce tomographic images of the redshifted 21-cm signal will enable direct studies of the evolut ...

#### Figures and Tables from this paper

Bubble mapping with the Square Kilometre Array – I. Detecting galaxies with Euclid, JWST, WFIRST, and ELT within ionized bubbles in the intergalactic medium at z > 6
The Square Kilometre Array (SKA) is expected to provide the first tomographic observations of the neutral intergalactic medium at redshifts z > 6 and pinpoint the locations of individual ionized ...
Analysis of 21-cm tomographic data
• Physics
• Proceedings of the International Astronomical Union
• 2017
Abstract The future SKA1-Low radio telescope will be powerful enough to produce tomographic images of the 21-cm signal from the Epoch of Reionization. Here we address how to identify ionized regionsExpand
Constraining the intergalactic medium at z ≈ 9.1 using LOFAR Epoch of Reionization observations
We derive constraints on the thermal and ionization states of the intergalactic medium (IGM) at redshift ≈ 9.1 using new upper limits on the 21-cm power spectrum measured by the LOFAR radio telescopeExpand
SKA-Low Intensity Mapping Pathfinder Updates: Deeper 21 cm Power Spectrum Limits from Improved Analysis Frameworks
The Square Kilometre Array (SKA) is a planned radio interferometer of unprecedented scale that will revolutionize low-frequency radio astronomy when completed. In particular, one of its core scienceExpand
Position-dependent power spectra of the 21-cm signal from the epoch of reionization
• Physics
• Journal of Cosmology and Astroparticle Physics
• 2019
The 21-cm signal from the epoch of reionization is non-Gaussian. Current radio telescopes are focused on detecting the 21-cm power spectrum, but in the future the Square Kilometre Array isExpand
The 21-cm bispectrum as a probe of non-Gaussianities due to X-ray heating
We present analysis of the normalized 21-cm bispectrum from fully-numerical simulations of intergalactic-medium heating by stellar sources and high-mass X-ray binaries (HMXBs) during the cosmic dawn.Expand
Neutral island statistics during reionization from 21-cm tomography
• Physics
• Monthly Notices of the Royal Astronomical Society
• 2019
We present the prospects of extracting information about the epoch of reionization by identifying the remaining neutral regions, referred to as islands, in tomographic observations of theExpand
Reionisation & Cosmic Dawn Astrophysics from the Square Kilometre Array: Impact of Observing Strategies
• Physics
• Monthly Notices of the Royal Astronomical Society
• 2019
Interferometry of the cosmic 21-cm signal is set to revolutionise our understanding of the Epoch of Reionisation (EoR) and the Cosmic Dawn (CD). The culmination of ongoing efforts will be theExpand
Period spacings of γ Doradus pulsators in the Kepler field: detection methods and application to 22 slow rotators
• Physics
• 2019
In $\gamma$ Doradus stars, the g-mode period spacing shows an approximately linear relation with period. The slope is a new asteroseismic diagnostic, related to the rotation rate and the azimuthalExpand
Constraining the reionization history using deep learning from 21-cm tomography with the Square Kilometre Array
• Physics
• 2020
Upcoming 21cm surveys with the SKA1-LOW telescope will enable imaging of the neutral hydrogen distribution on cosmological scales in the early Universe. These surveys are expected to generate hugeExpand

#### References

SHOWING 1-10 OF 60 REFERENCES
Probing reionization with LOFAR using 21-cm redshift space distortions
One of the most promising ways to study the epoch of reionization (EoR) is through radio observations of the redshifted 21-cm line emission from neutral hydrogen. These observations are complicatedExpand
The large-scale observational signatures of low-mass galaxies during reionization
• Physics
• 2016
Observations of the epoch of reionization give us clues about the nature and evolution of the sources of ionizing photons, or early stars and galaxies. We present a new suite of structure formationExpand
21-cm signature of the first sources in the Universe: prospects of detection with SKA
• Physics
• 2016
Currently several low-frequency experiments are being planned to study the nature of the first stars using the redshifted 21-cm signal from the cosmic dawn and epoch of reionization. Using aExpand
Reionization and Cosmology with 21-cm Fluctuations
• Physics
• 2010
Measurement of the spatial distribution of neutral hydrogen via the redshifted 21-cm line promises to revolutionize our knowledge of the epoch of reionization and the first galaxies, and may provideExpand
21 cm tomography of the high-redshift universe with the Square Kilometer Array
• Physics
• 2004
Abstract We discuss the prospects for “tomography” of the intergalactic medium (IGM) at high redshifts using the 21 cm transition of neutral hydrogen. Existing observational constraints on the epochExpand
The GMRT Epoch of Reionization experiment: a new upper limit on the neutral hydrogen power spectrum at z≈ 8.6
We present a new upper limit to the 21cm power spectrum during the Epoch of Reionization (EoR) which constrains reionization models with an unheated IGM. The GMRT-EoR experiment is an ongoing effortExpand
Reionization and the Cosmic Dawn with the Square Kilometre Array
The Square Kilometre Array (SKA) will have a low frequency component (SKA-low) which has as one of its main science goals the study of the redshifted 21 cm line from the earliest phases of star andExpand
Light cone effect on the reionization 21-cm signal – II. Evolution, anisotropies and observational implications
Measurements of the H I 21-cm power spectra from the reionization epoch will be influenced by the evolution of the signal along the line-of-sight direction of any observed volume. We use numerical asExpand
HI tomographic imaging of the Cosmic Dawn and Epoch of Reionization with SKA
• Physics
• 2015
We provide an overview of 21cm tomography of the Cosmic Dawn and Epoch of Reionization as possible with SKA-Low. We show why tomography is essential for studying CD/EoR and present the scales whichExpand
The Hydrogen Epoch of Reionization Array (HERA)
• D. DeBoer
• Art, Physics
• 2016 International Conference on Electromagnetics in Advanced Applications (ICEAA)
• 2016
The Hydrogen Epoch of Reionization Array (HERA http://reionization.org) is a staged experiment that uses the unique properties of the 21-cm line from neutral hydrogen to probe the Epoch ofExpand