Imaging the 21-cm Signal from the Cosmic Dawn & Epoch of Reionization and the Connection with the Global Signal

arXiv:2606.24724 · astro-ph.CO · Submitted 2026-06-23 · Read on arXiv

Satadru Bag, Michele Bianco, Samir Choudhuri, Saswata Dasgupta, Abhirup Datta, Kanan K. Datta, Ivelin Georgiev, Sambit K. Giri, Ian Hothi, Akanksha Kapahtia, Suman Majumdar, Garrelt Mellema, Arnab Mishra, Samit Kumar Pal, Feiyu Zhao

astro-ph.CO

Submitted: 2026-06-23

Comments: Published in Advancing Astrophysics with the SKA II (AASKAII), 2026 (arXiv:2606.20366). Report-no:AASKAII/Bag01

License: http://creativecommons.org/licenses/by-nc-sa/4.0/

The gist: The original baseline design for SKA-Low was motivated by the ability to produce tomographic images of the redshifted 21-cm signal, thus allowing the research field to move beyond the simple

Terminology

21-cm signal — 29× in this paper · explained in 1 episode
Calibration — 12× in this paper · explained in 7 episodes
Cosmic Dawn — 8× in this paper
Epoch of Reionization — 4× in this paper
Trace — 4× in this paper · explained in 2 episodes
Fidelity — 3× in this paper · explained in 2 episodes
21-cm Power Spectrum — 2× in this paper · explained in 1 episode
Clustering — 2× in this paper · explained in 2 episodes
Convolutional Neural Networks (CNNs) — 2× in this paper · explained in 2 episodes
Largest Cluster Statistic — 2× in this paper
Robustness — 2× in this paper · explained in 5 episodes
21-cm global signal — 1× in this paper · explained in 1 episode
Accuracy — 1× in this paper · explained in 1 episode
Anisotropy — 1× in this paper · explained in 3 episodes
Anti-correlation — 1× in this paper · explained in 3 episodes
Bayesian Inference — 1× in this paper · explained in 5 episodes
Bispectrum — 1× in this paper · explained in 3 episodes
Consistency — 1× in this paper · explained in 3 episodes
Contour Minkowski Tensor — 1× in this paper
Core — 1× in this paper · explained in 2 episodes
Generalization — 1× in this paper · explained in 13 episodes
Generative Model — 1× in this paper · explained in 2 episodes
Generative Modeling — 1× in this paper · explained in 3 episodes
Non-Gaussianity — 1× in this paper · explained in 2 episodes
Persistent Homology — 1× in this paper · explained in 3 episodes
Sparsity — 1× in this paper · explained in 4 episodes
Wavelet Phase Harmonics — 1× in this paper
Wavelet Scattering Transform — 1× in this paper
Wavelet Transform — 1× in this paper · explained in 2 episodes

Abstract

The original baseline design for SKA-Low was motivated by the ability to produce tomographic images of the redshifted 21-cm signal, thus allowing the research field to move beyond the simple statistic of the power spectrum. In this chapter we review the imaging capabilities of SKA-Low, the wide variety of methods proposed for quantatively analysing image data, as well as the connection with the global 21-cm signal.

Sources

Exploring the Geometry, Topology and Morphology of Large Scale Structure using Minkowski Functionals

Terminology

Abstract

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