Observing the reionization epoch through 21-centimetre radiation

  title={Observing the reionization epoch through 21-centimetre radiation},
  author={Steven R. Furlanetto and Aaron Sokasian and Lars Hernquist},
  journal={Monthly Notices of the Royal Astronomical Society},
We study the observability of the reionization epoch through the 21-cm hyperfine transition of neutral hydrogen. We use a high-resolution cosmological simulation (including hydrodynamics) together with a fast radiative transfer algorithm to compute the evolution of 21-cm emission from the intergalactic medium (IGM) in several different models of reionization. We show that the mean brightness temperature of the IGM drops from δTb ∼ 25 mK to ∼10 −2 mK during overlap (over a frequency interval… 

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