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Table A.1
Used rates for chemical evolution, cooling, and heating.
| Process | Type | Species | Coefficient | Value |
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| standard recombination | chemical | H ii | αHii |
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| He ii | α Heii | 1.50 × 10-10T-0.6353 | ||
| He iii | α Heiii |
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| cooling | H ii | η Hii |
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| He i | η Hei | 1.55 × 10-26T0.3647 | ||
| He ii | η Heii |
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| dielectric recombination | chemical | He ii | ξ Heii | 1.90 × 10-3T-1.5exp( − 470000 / T)(1 + 0.3exp( − 94000 / T)) |
| cooling | He ii | ω Heii | 1.24 × 10-13T-1.5exp( − 470000 / T)(1 + 0.3exp( − 94000 / T)) | |
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| collisional ionization | chemical | H i | β Hii |
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| He i | β Heii |
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| He ii | β Heiii |
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| cooling | H i | ζ Hi |
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| He ii | ζ Heii |
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| He iii | ζ Heiii |
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| photoionization | chemical | H i | γ Hii | 2.54 × 108j0 |
| He i | γ Heii | 2.49 × 108j0 | ||
| He ii | γ Heiii | 1.60 × 107j0 | ||
| heating | H i | ε Hi | 7.75 × 10-12γHi | |
| He i | ε Hei | 2.19 × 10-11γHei | ||
| He ii | ε Heii | 3.10 × 10-11γHeii | ||
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| collisional excitation | cooling | H i | ψ Hi |
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| He ii | ψ Heii |
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| bremsstrahlung | cooling | all ions | θ | 1.42 × 10-27gffT0.5 with the gaunt-factor gff = 1.5 |
Notes. Rates of collisional processes are taken from Katz et al. (1996, Tables 1 and 2); Photoionization and photoheating rates are taken from Black (1981, Sect. 2.1). Tα denotes T / 10α K.
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