Papers › On the maximum amplitude of the high-redshift 21-cm absorption feature
On the maximum amplitude of the high-redshift 21-cm absorption feature
Pablo Villanueva-Domingo, Olga Mena, Jordi Miralda-Escudé
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We examine the maximum possible strength of the global 21-cm absorption dip on the Cosmic Background Radiation at high-redshift caused by the atomic intergalactic medium, when the Lyman-α coupling is maximum, assuming no exotic cooling mechanisms from interactions with dark matter. This maximum absorption is limited by three inevitable factors that need to be accounted for: (a) heating by energy transferred from the Cosmic Background Radiation to the hydrogen atoms via 21-cm transitions, dubbed as 21-cm heating; (b) Lyα heating by scatterings of Lyα photons from the first stars; (c) the impact of the expected density fluctuations in the intergalactic gas in standard Cold Dark Matter theory, which reduces the mean 21-cm absorption signal. Inclusion of this third novel effect reduces the maximum global 21-cm absorption by ∼10%. Overall, the three effects studied here reduce the 21-cm global absorption by ∼20% at z ≃17.
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