Interferometric HI Intensity Mapping of the Late Time Universe with SKA-Mid

arXiv:2606.24730 · astro-ph.CO · Submitted 2026-06-23 · Read on arXiv

Aishrila Mazumder, Zhaoting Chen, Junaid Townsend, Suman Chatterjee, Zhixing Li, Sourabh Paul, Reza Ansari, Laura Wolz, Mario G. Santos

astro-ph.CO

Submitted: 2026-06-23

Comments: Published in Advancing Astrophysics with the SKA II (AASKAII), 2026 (arXiv:2606.20366). Report-no:AASKAII/Mazumder01

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

The gist: We discuss the progress towards using the SKA-Mid for interferometric neutral hydrogen (HI) intensity mapping surveys.

Terminology

Clustering — 15× in this paper · explained in 2 episodes
Robustness — 5× in this paper · explained in 5 episodes
Velocity Dispersion — 5× in this paper · explained in 2 episodes
Calibration — 4× in this paper · explained in 7 episodes
Accuracy — 3× in this paper · explained in 1 episode
MeerKAT All-Sky Simulator — 3× in this paper
Core — 2× in this paper · explained in 2 episodes
Degeneracy — 2× in this paper · explained in 3 episodes
21-cm signal — 1× in this paper · explained in 1 episode
Baryon Acoustic Oscillation — 1× in this paper
Baseline-Level Flagging — 1× in this paper
Bayesian Inference — 1× in this paper · explained in 5 episodes
Canadian Hydrogen Intensity Mapping Experiment — 1× in this paper
Matter Power Spectrum — 1× in this paper · explained in 2 episodes
Trace — 1× in this paper · explained in 2 episodes
alpha — 1× in this paper · explained in 1 episode

Abstract

We discuss the progress towards using the SKA-Mid for interferometric neutral hydrogen (HI) intensity mapping surveys. By mapping the distribution of cosmic HI distribution through the 21cm line, SKA-Mid will be able to measure the HI power spectrum at small angular separations in interferometric mode. We review the measurements made from the precursor MeerKAT telescope, using the MeerKAT DEEP2 as well as the MIGHTEE survey data, yielding tentative detection as well as upper limits on HI clustering. The methodology for MeerKAT can be naturally extended to SKA-Mid. Forecasts suggest that SKA-Mid AA4 will be able to measure the HI power spectrum with high statistical significance across a wide range of redshifts from z about1.0 to z about 3.0, around nonlinear scales k about 1.0, Mpc-1. The precise measurements can be used to constrain the properties of HI galaxies, providing a novel window into probing galaxy evolution at 1.0 z 3.0.

Interferometric HI Intensity Mapping of the Late Time Universe with SKA-Mid

Terminology

Abstract

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