Cross-correlating Squared kSZ and HI Intensity Fields: A Map-level ACT--MeerKAT Forecast

arXiv:2609.36863 · astro-ph.CO · Submitted 2026-09-29 · Read on arXiv

astro-ph.CO

Submitted: 2026-09-29

Updated: 2026-09-29

Code: https://github.com/msyriac/orphics

Terminology

• Atacama Cosmology Telescope — 5× in this paper
• Anisotropy — 3× in this paper · explained in 3 episodes
• Aperture — 3× in this paper · explained in 1 episode
• Calibration — 3× in this paper · explained in 7 episodes
• Simons Observatory — 3× in this paper
• 21-cm intensity mapping — 2× in this paper · explained in 2 episodes
• Clustering — 2× in this paper · explained in 2 episodes
• Core — 2× in this paper · explained in 2 episodes
• Frequency Dependence — 2× in this paper · explained in 2 episodes
• Society of Photo-Optical Instrumentation Engineers — 2× in this paper
• Trace — 2× in this paper · explained in 2 episodes
• Velocity Dispersion — 2× in this paper · explained in 2 episodes
• 21-cm signal — 1× in this paper · explained in 1 episode
• Accuracy — 1× in this paper · explained in 1 episode
• Baryonic Feedback — 1× in this paper · explained in 3 episodes
• Canadian Hydrogen Intensity Mapping Experiment — 1× in this paper
• Chinese Space-station Survey Telescope — 1× in this paper
• Consistency — 1× in this paper · explained in 3 episodes
• Innovation and National Research Foundation — 1× in this paper
• Matter Power Spectrum — 1× in this paper · explained in 2 episodes
• Metallicity — 1× in this paper · explained in 3 episodes
• Signal-to-noise ratio (SNR) — 1× in this paper · explained in 2 episodes
• Square Kilometre Array — 1× in this paper

Sources

• The Atacama Cosmology Telescope: A Measurement of the Cosmic Microwave Background Power Spectra at 98 and 150 GHz
• Evidence for the kinematic Sunyaev-Ze\v{l}dovich effect with ACTPol and velocity reconstruction from BOSS
• The Simons Observatory: Science Goals and Forecasts for the Enhanced Large Aperture Telescope
• SPT-3G D1: CMB temperature and polarization power spectra and cosmology from 2019 and 2020 observations of the SPT-3G Main field
• Evidence of Galaxy Cluster Motions with the Kinematic Sunyaev-Zel'dovich Effect
• Planck intermediate results. XXXVII. Evidence of unbound gas from the kinetic Sunyaev-Zeldovich effect
• Measurement of the pairwise kinematic Sunyaev-Zeldovich effect with Planck and BOSS data
• Constraints on the missing baryons from the kinetic Sunyaev-Zeldovich effect in Planck data
• Evidence for large baryonic feedback at low and intermediate redshifts from kinematic Sunyaev-Zel'dovich observations with ACT and DESI photometric galaxies
• The Kinematic Sunyaev-Zel'dovich Effect with Projected Fields: A Novel Probe of the Baryon Distribution with Planck, WMAP, and WISE Data
• The Kinematic Sunyaev-Zel'dovich Effect with Projected Fields II: prospects, challenges, and comparison with simulations
• Cosmology with a SKA HI intensity mapping survey
• Forecasts of cosmological constraints from HI intensity mapping with FAST, BINGO & SKA-I
• Lack of clustering in low-redshift 21-cm intensity maps cross-correlated with 2dF galaxy densities
• Searching for HI imprints in cosmic web filaments with 21-cm intensity mapping
• The neutral hydrogen distribution in large-scale haloes from 21-cm intensity maps
• Measurement of 21 cm brightness fluctuations at z ~ 0.8 in cross-correlation
• Calibrating CHIME, A New Radio Interferometer to Probe Dark Energy
• Canadian Hydrogen Intensity Mapping Experiment (CHIME) Pathfinder
• 1/f Noise Analysis for FAST HI Intensity Mapping Drift-Scan Experiment

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• Non-Gaussian Galaxy Stochasticity and the Noise-Field Formulation