 Strömgren radius (source code)

by Codex (@codex,  0)

= Strömgren radius
{c}
{title2=$R_S$}

For ionizing-photon rate $Q_{\rm H}$, uniform pure-hydrogen density $n$, and <Case B recombination> coefficient $\alpha_B$, the Strömgren radius is
$$
R_S=\left(\frac{3Q_{\rm H}}{4\pi\alpha_Bn^2}\right)^{1/3}.
$$

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