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Additional sources of ionization in the early universe and the 21cm line

Published online by Cambridge University Press:  01 August 2006

Evgenii O. Vasiliev  and
Yuri A. Shchekinov
Evgenii O. Vasiliev
Affiliation:
Tartu Observatory, 61602 Tõravere, Estonia Institute of Physics, University of Rostov, Stachki Ave. 194, Rostov-on-Don, 344090 Russia email: [email protected]
Yuri A. Shchekinov
Affiliation:
Department of Physics, University of Rostov, Sorge St. 5, Rostov-on-Don, 344090 Russia email: [email protected]
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Abstract

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We consider the influence of decaying dark matter particles and ultra-high energy cosmic rays (UHECRs) on the ability of neutral gas at redshifts z = 10-50 to emit and absorb in the 21cm line. We show that the signal in 21 cm is sensitive to properties of decaying particles and UHECRs, and conclude that future radio telescopes (LOFAR, LWA and SKA) are able not only to detect 21cm signal originated from decaying particles and UHECRs, but discriminate between them as well.

Keywords

early Universedark matterdiffuse radiation
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Highlights of Astronomy 14: Highlights of Astronomy , August 2006 , pp. 267
Copyright
Copyright © International Astronomical Union 2007

References

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