@Article{Villanueva-Domingo_etal2020,
author="Villanueva-Domingo, P.
and Mena, O.
and Miralda-Escude, J.",
title="Maximum amplitude of the high-redshift 21-cm absorption feature",
journal="Physical Review D",
year="2020",
publisher="Amer Physical Soc",
volume="101",
number="8",
pages="083502--8pp",
abstract="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-alpha 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) Ly alpha heating by scatterings of Ly alpha 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 similar to 10{\%}. Overall, the three effects studied here reduce the 21-cm global absorption by similar to 20{\%} at z similar or equal to 17.",
optnote="WOS:000523343100006",
optnote="exported from refbase (https://references.ific.uv.es/refbase/show.php?record=4360), last updated on Thu, 18 Jun 2020 11:08:44 +0000",
issn="2470-0010",
doi="10.1103/PhysRevD.101.083502",
opturl="https://arxiv.org/abs/1912.09488",
opturl="https://doi.org/10.1103/PhysRevD.101.083502",
language="English"
}