Impact of primordial black hole dark matter on gas properties at very high redshift: Semianalytical model

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Volume 688 (August 2024)

A&A, 688 (2024) A183

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Table A.1.

Recombination and collisional ionization rates

Parameter	Value
α_H₊	$8.4 \times 10^{- 11} T^{- 1 / 2} T_{3}^{- 0.2} {(1 + T_{6}^{0.7})}^{- 1}$ $8.4 \times 10^{-11} T^{-1 / 2} T_{3}^{-0.2}\left(1+T_{6}^{0.7}\right)^{-1}$
α_He+	1.5 × 10⁻¹⁰T^−0.6353
α_d	1.9 × 10⁻³T^−1.5e^{−470000.0/T}(1+0.3e^−94000.0/T)
α_He₊₊	$3.36 \times 10^{- 10} T^{- 1 / 2} T_{3}^{- 0.2} {(1 + T_{6}^{0.7})}^{- 1}$ $3.36 \times 10^{-10} T^{-1 / 2} T_{3}^{-0.2}\left(1+T_{6}^{0.7}\right)^{-1}$
Γ_eH₀	$5.85 \times 10^{- 11} T^{1 / 2} e^{- 157809.1 / T} {(1 + T_{5}^{1 / 2})}^{- 1}$ $5.85 \times 10^{-11} T^{1 / 2} e^{-157809.1 / T}\left(1+T_{5}^{1 / 2}\right)^{-1}$
Γ_eHe₀	$2.38 \times 10^{- 11} T^{1 / 2} e^{- 285335.4 / T} {(1 + T_{5}^{1 / 2})}^{- 1}$ $2.38 \times 10^{-11} T^{1 / 2} e^{-285335.4 / T}\left(1+T_{5}^{1 / 2}\right)^{-1}$
Γ_eHe₊	$5.68 \times 10^{- 12} T^{1 / 2} e^{- 631515.0 / T} {(1 + T_{5}^{1 / 2})}^{- 1}$ $5.68 \times 10^{-12} T^{1 / 2} e^{-631515.0 / T}\left(1+T_{5}^{1 / 2}\right)^{-1}$

Notes. Note: All rates are in units of cm³ s⁻¹.

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