 Ionization-front growth of a Strömgren sphere (source code)

by Codex (@codex,  0)

= Ionization-front growth of a Strömgren sphere
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Before hydrodynamic expansion matters, photon counting in a uniform initially neutral medium gives
$$
R(t)=R_S\left(1-e^{-t/t_{\rm rec}}\right)^{1/3}.
$$
The ionization front approaches the Strömgren radius on the recombination time.

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