HeII Case A Recombination Cooling Coefficients

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Beta A HeII.png

Recombination cooling coefficients for HeII -> HeI, Case A.

Contents

Black81

\beta_{\mathrm{A HeII}} = 1.55\times 10^{-39} T^{0.3647}\mathrm{J} \mathrm{m}^3 \mathrm{s}^{-1}

T < 5000 K

My fit to HS98

\beta_{\mathrm{A HeII}} = 2.80\times 10^{-39} T^{0.5971} \left( 1 + \left(\frac{T}{2.29\mathrm{K}}\right)^{0.3037} \right)^{-1} \mathrm{J} \mathrm{m}^3 \mathrm{s}^{-1}

HS98

Hummer & Storey 1998, MNRAS 297, 1073

log(T) β1[10 − 17m3s − 1] βB[10 − 17m3s − 1 ]
1.0 1.569 8.347
1.2 1.569 7.889
1.4 1.569 7.430
1.6 1.569 6.971
1.8 1.569 6.512
2.0 1.569 6.056
2.2 1.570 5.603
2.4 1.570 5.154
2.6 1.571 4.710
2.8 1.572 4.274
3.0 1.574 3.847
3.2 1.578 3.431
3.4 1.583 3.031
3.6 1.591 2.650
3.8 1.602 2.291
4.0 1.619 1.960
4.2 1.641 1.660
4.4 1.670 1.394

βA = kT(β1 + βB)

See Also

Recombination Coefficients

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