Particle decay in the early universe: predictions for 21 cm

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dc.creatorShchekinov, Yu. A.
dc.creatorVasiliev, E. O.
dc.date2006-04-11
dc.date2007-04-13
dc.date.accessioned2026-07-07T11:04:00Z
dc.date.available2026-07-07T11:04:00Z
dc.descriptionThe influence of ultra-high energy cosmic rays (UHECRs) and decaying dark matter particles on the emission and absorption characteristics of neutral hydrogen in 21 cm at redshifts $z = 10-50$ is considered. In presence of UHECRs 21 cm can be seen in absorption with the brightness temperature $T_b=-(5-10)$ mK in the range $z=10-30$. Decayng particles can stimulate a 21 cm signal in emission with $T_b\sim 50-60$ mK at $z =50$, and $T_b \simeq 10$ mK at $z \sim 20$. Characteristics of the fluctuations of the brightness temperature, in particular, its power spectrum are also calculated. The maps of the power spectrum of the brightness temperature on the plane {\it wavenumber-redshift} are shown to be sensitive to the parameters of UHECRs and decaying dark matter. Observational possibilities to detect manifestations of UHECRs and/or decaying particles in 21 cm with the future radio telescopes (LOFAR, 21CMA and SKA), and to distinguish contributions from them are briefly discussed.
dc.description10 pages, 9 figures, accepted in MNRAS
dc.identifierhttps://arxiv.org/abs/astro-ph/0604231
dc.identifierhttp://arxiv.org/abs/astro-ph/0604231
dc.identifierMon.Not.Roy.Astron.Soc.379:1003-1010,2007
dc.identifierdoi:10.1111/j.1365-2966.2007.11715.x
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/188743
dc.subjectAstrophysics
dc.titleParticle decay in the early universe: predictions for 21 cm
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