The SOFIA Massive (SOMA) star formation Q-band follow-up - II. Hydrogen recombination lines towards high-mass protostars

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Table 4

Comparison of LTE-predicted and observed line intensity ratios.

Ratio	LTE	Observed ratio
	value
		G45.47	G45.12	G28.20	Orion KL^a
$\frac{H 64 β}{H 51 α}$ ${{H64\beta } \over {H51\alpha }}$	0.278	0.25	0.25	0.28	0.43
$\frac{H 65 β}{H 52 α}$ ${{H65\beta } \over {H52\alpha }}$	0.274	0.20	0.22	0.25	0.31
$\frac{H 67 β}{H 53 α}$ ${{H67\beta } \over {H53\alpha }}$	0.283	0.25	0.22	0.19	0.43
$\frac{H 68 β}{H 54 α}$ ${{H68\beta } \over {H54\alpha }}$	0.280	0.25	0.23	0.27	0.32
$\frac{H 69 β}{H 55 α}$ ${{H69\beta } \over {H55\alpha }}$	0.277	0.33	0.30	0.25	0.33
$\frac{H 70 β}{H 56 α}$ ${{H70\beta } \over {H56\alpha }}$	0.274	0.25	0.22	0.23	0.30
$\frac{H 72 β}{H 57 α}$ ${{H72\beta } \over {H57\alpha }}$	0.282	0.25	0.24	0.27	–
$\frac{H 73 β}{H 58 α}$ ${{H73\beta } \over {H58\alpha }}$	0.279	0.25	0.22	0.27	–

Notes. ^aData taken from Liu et al. (2022).

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