Redshifted 21 centimeter emission from the pre-reionization era. I. Mean signal and linear fluctuations

@article{Gnedin2004Redshifted2C,
  title={Redshifted 21 centimeter emission from the pre-reionization era. I. Mean signal and linear fluctuations},
  author={Nickolay Y. Gnedin and Peter A. Shaver},
  journal={The Astrophysical Journal},
  year={2004},
  volume={608},
  pages={611-621}
}
We use cosmological simulations of reionization to predict the possible signal from the redshifted 21 cm line of neutral hydrogen in the pre-reionization era and to investigate the observability of this signal. We show that the separation of the mean (global) signal over the whole sky from the known foreground contamination may be feasible but very challenging. In agreement with previous studies, we demonstrate that measuring angular fluctuations in the H I signal is likely to be extremely… Expand
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TLDR
An all-sky spectrum of the 21-centimetre line of atomic hydrogen in the early Universe, corresponding to the redshift range 6 < z  < 13 for the 21 centimetres line, shows that reionization happened rapidly and there should be a characteristic signature visible against the smooth foreground in an all-Sky spectrum. Expand
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The sky-averaged (global) 21 cm signal is a powerful probe of the intergalactic medium (IGM) prior to the completion of reionization. However, so far it has been unclear whether it will provide moreExpand
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We use numerical hydrodynamical simulations of early structure formation in a ΛCDM universe to investigate the spin temperature and 21 cm brightness of the diffuse intergalactic medium (IGM) prior toExpand
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