Radio recombination lines contaminate the post-reionization 21 cm power spectrum at roughly 10^-4 of the signal near BAO scales, shifting BAO extrema by a few x 10^-6 to 10^-5—well below the cosmic-variance limit.
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Radio Recombination Line Contamination in Post-Reionization 21 cm Intensity Mapping
Radio recombination lines contaminate the post-reionization 21 cm power spectrum at roughly 10^-4 of the signal near BAO scales, shifting BAO extrema by a few x 10^-6 to 10^-5—well below the cosmic-variance limit.