Infra-red emission line tomography of the intergalactic medium during
  the Epoch of Reionization
  The first major star-forming galaxies and Active Galactic Nuclei will produce
Balmer and higher order extended haloes during the Epoch of Reionization
through the scattering of Lyman resonance line photons off the surrounding
neutral intergalactic gas. The optical depth dependence of the scattering rates
will produce a signal sensitive to both the density and velocity fluctuations
of the gas, offering the possibility of probing the ionization region and flow
field surrounding young star-forming galaxies. The requirements for detecting
the haloes in the infra-red using a space-based telescope are discussed, along
with an assessment of the possibility of detecting the haloes using the Tunable
Filter Imager on the James Webb Space Telescope.
