Constraining reionization morphology and source properties with 21cm galaxy cross-correlation surveys

May 1, 2026

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Key Points

This research aims to investigate the use of 21cm galaxy cross-correlation surveys to enhance constraints on reionization morphology and source properties.
Analyzed cross-correlations between 21cm observations and galaxy surveys.
Used a simulation-based inference framework (EoRFlow) for likelihood-free parameter estimation.
Examined impacts of field of view, redshift precision, and minimum halo mass on constraints.
Cross-power spectra achieved unbiased constraints with posterior volumes of ∼10% relative to priors.
Measurements reduced posterior volumes by 20-30% compared to auto-power alone.
Photometric redshifts were shown to render cross-correlations uninformative, emphasizing the need for precise redshifts.

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Cross-power spectra improve constraints on ionizing source properties and neutral hydrogen fraction, indicating key roles for photometric redshifts.

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Pietschke et al. (2026) studied this question.

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