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

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Table 6

Thermal and dynamical broadening of HRLs.

Transition	Thermal width (km/s)	G45.12+0.13		G45.47+0.05		G28.20−0.05		Orion KL
		Measured FWHM Dyn. widtH		Measured FWHM Dyn. widtH		Measured FWHM Dyn. widtH		Measured FWHM Dyn. width
		(km/s)		(km/s)		(km/s)		(km/s)
H51α	18.54	41.46	22.92	29.30	10.76	34.60	16.06	23.70	5.16
H52α	18.54	40.78	22.24	47.83	29.29	36.68	18.14	24.20	5.66
H53α	18.54	42.66	24.12	32.21	13.67	34.24	15.70	24.50	5.96
H54α	18.54	42.51	23.97	37.37	18.83	34.36	15.82	24.09	5.55
H55α	18.54	38.65	20.11	41.48	22.94	26.09	7.55	23.94	5.40
H56α	18.54	41.55	23.01	34.78	16.24	37.97	19.43	25.60	7.06
H57α	18.54	39.22	20.68	34.30	15.76	35.88	17.34	–	–
H58α	18.54	43.68	25.14	34.07	15.53	33.93	15.39	–	–
H64β	18.54	45.10	26.56	40.74	22.20	–	–	17.70	0.00
H65β	18.54	40.97	22.43	28.90	10.36	34.68	16.14	22.80	4.26
H66β	18.54	40.96	22.42	47.38	28.84	32.17	13.63	24.50	5.96
H67β	18.54	40.26	21.72	26.17	7.63	32.51	13.97	24.00	5.46
H68β	18.54	40.38	21.84	42.68	24.14	40.87	22.33	24.00	5.46
H69β	18.54	47.59	29.05	41.69	23.15	32.60	14.06	23.80	5.26
H70β	18.54	43.02	24.48	37.86	19.32	31.58	13.04	25.10	6.56
H71β	18.54	46.71	28.17	40.26	21.72	43.66	25.12	24.00	5.46
H72β	18.54	49.32	30.78	–	–	30.24	11.70	–	–
H73β	18.54	40.33	21.79	33.40	14.86	34.06	15.52	–	–

Notes. Thermal line widths are estimated using a fixed electron temperature of 7500 K, which was estimated based on their Galactocentric distance and roughly similar values for all sources within uncertainties. For this, we assume a negligible effect from pressure broadening.

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