A lower limit of Δz > 0.06 for the duration of the reionization epoch

@article{Bowman2010ALL,
  title={A lower limit of $\Delta$z > 0.06 for the duration of the reionization epoch},
  author={Judd D. Bowman and Alan E. E. Rogers},
  journal={Nature},
  year={2010},
  volume={468},
  pages={796-798}
}
Observations of the 21-centimetre line of atomic hydrogen in the early Universe directly probe the history of the reionization of the gas between galaxies. The observations are challenging, though, because of the low expected signal strength (∼10 mK), and contamination by strong (>100 K) foreground synchrotron emission in the Milky Way and extragalactic continuum sources. If reionization happened rapidly, there should be a characteristic signature visible against the smooth foreground in an all… Expand

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