HII Case B Recombination Cooling Coefficients

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Recombination cooling coefficients for HII -> HI, Case B.

Contents 1 HG97 2 Osterbrock89 3 Ferland92 4 Hummer94 5 See Also

HG97

Hui & Gnedin 1997 MNRAS 292, 27

Osterbrock89

T	(kT)-1βB HII [10^{-19} m3 s-1]
2500	5.80
5000	3.22
10000	1.73
20000	0.917

Ferland92

log(T)	βB [10-28 J m3 s-1]
0.5	229.5
1.0	359.5
1.5	551.4
2.0	823.6
2.5	1187
3.0	1629
3.5	2082
4.0	2395
4.5	2376
5.0	1981
5.5	1390
6.0	831.6
6.5	430.7
7.0	196.7
7.5	81.09
8.0	30.92
8.5	11.15
9.0	3.872
9.5	1.316
10	.4436

Hummer94

Hummer 1994 MNRAS 268, 109

log(T)	β'B [10-17 m3 s-1]
1.0	8.287
1.2	7.821
1.4	7.356
1.6	6.892
1.8	6.430
2.0	5.971
2.2	5.515
2.4	5.062
2.6	4.614
2.8	4.170
3.0	3.734
3.2	3.306
3.4	2.888
3.6	2.484
3.8	2.098
4.0	1.736
4.2	1.402
4.4	1.103
4.6	0.8442
4.8	0.6279
5.0	0.4539
5.2	0.3192
5.4	0.2185
5.6	0.1458
5.8	0.09484
6.0	0.06023
6.2	0.03738
6.4	0.02268
6.6	0.01348
6.8	0.007859
7.0	0.004499

β_{B HII} = kT β'_B

See Also

Recombination Coefficients