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August 22, 2025The Astrophysical JournalOpen Access

The Impact of Foregrounds on Dark Ages Measurements with the Highly Redshifted 21 cm Line

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Analysis shows foreground wedge impacts dark ages measurements in 21 cm cosmology, suggesting necessary techniques for sensitivity.

Foreground contamination significantly affects measurements at high redshifts, warranting careful techniques for accurate data interpretation.
Foreground avoidance methods typically lose sensitivity by one order of magnitude when applied to high-redshift observations.
This observational analysis highlights the need for some foreground subtraction to correctly interpret the faint 21 cm signals from the early universe.
Improving measurement precision during the dark ages will rely on refining techniques to address high sky temperatures and noise levels.

Pober et al. (2025) studied this question.

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August 22, 2025The Astrophysical JournalOpen Access

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Authors

Analysis shows foreground wedge impacts dark ages measurements in 21 cm cosmology, suggesting necessary techniques for sensitivity.

Foreground contamination significantly affects measurements at high redshifts, warranting careful techniques for accurate data interpretation.
Foreground avoidance methods typically lose sensitivity by one order of magnitude when applied to high-redshift observations.
This observational analysis highlights the need for some foreground subtraction to correctly interpret the faint 21 cm signals from the early universe.
Improving measurement precision during the dark ages will rely on refining techniques to address high sky temperatures and noise levels.

Pober et al. (2025) studied this question.

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