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Title

Maximum amplitude of the high-redshift 21-cm absorption feature

AuthorsVillanueva-Domingo, P.; Mena, Olga ; Miralda-Escudé, J.
Issue DateApr-2020
PublisherAmerican Physical Society
CitationPhysical Review D 101 (8): 083502 (2020)
AbstractWe 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.
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevD.101.083502
URIhttp://hdl.handle.net/10261/216042
Identifiersdoi: 10.1103/PhysRevD.101.083502
issn: 2470-0029
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