Astronomy & Astrophysics

Table 1: Ionization and recombination rates expressed in ${\rm s}^{-1} \ {\rm cm}^3$ (from Black 1981 and Cen 1992) with $T_{\rm en}=T_{\rm e}/10^n$ K the electron temperature.
Table 2: Cooling rates expressed in ${\rm erg} \ {\rm s}^{-1} \ {\rm cm}^{-3}$ (from Black (1981) with modifications introduced by Cen (1992) for temperatures exceeding 10⁵ K) with $T_{\rm en}=T_{\rm e}/10^n$ K the electron temperature, $g_{\rm ff}$ the Gaunt factor taken to 1.5, and $T_{\rm bg}$ the cosmic microwave background temperature, $T_{\rm bg}=2.7(1+z)$ .