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

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Table 1

Summary of target sources.

Source	RA	Dec	d	d_G	υ_LSR	L_bol	EM	S_v
(type)	(J2000)	(J2000)	(kpc)	(kpc)	(km/s)	(L_⊙ ) ^(d)	(pc cm⁻⁶)	(Jy)
G28.20−0.05 (I)	18^h42^m58.^s12	−4°13′57.″644	5.7	4.1	95.6	${1.4}_{- 0.95}^{+ 1.9} \times 10^{5}$ $1.4_{ - 0.95}^{ + 1.9} \times {10^5}$	3 6 × 10⁸(a)	0.630(e)
G31.28+0.06 (I)	18^h48^m11.^s82	−01°26′31.″01	4.9	4.97	110.0	1.03 × 10⁵		0.234(f)
G45.47+0.05 (II)	19^h14^m25.^s74	+11°09′25.″90	8.4	5.80	61.5	${3.5}_{- 1.4}^{+ 2.4} \times 10^{5}$ $3.5_{ - 1.4}^{ + 2.4} \times {10^5}$	4.8 × 10⁷(b)	0.200(g)
G19.08−0.29 (II)	18^h26^m48.^s43	−12°26′28.″04	4.5	3.84	65.4			–
G35.20−0.74 (III)	18^h58^m13.^s03	+01°40′36.″ 14	2.2	6.45	32.0	${6.6}_{- 2.4}^{+ 3.7} \times 10^{4}$ $6.6_{ - 2.4}^{ + 3.7} \times {10^4}$	3.3 × 10⁸(c)	0.010(h)
G45.12+0.13 (III)	19^h13^m27.^s96	+10°53′35.″ 690	7.4	5.77	59.5	${8.0}_{- 3.6}^{+ 6.5} \times 10^{5}$ $8.0_{ - 3.6}^{ + 6.5} \times {10^5}$	1.5 × 10⁹(b)	5.400(g)

Notes. d: distance; d_G: galactocentric distance; EM: emission measure; (a) Sewiło et al. (2008); (b) Wood & Churchwell (1989); (c) Beltrán et al. (2016); (d) Telkamp et al. (2025); Law et al. (2022); Minier et al. (2005), (e) Sewiło et al. (2011), (f) Codella et al. (2010), (g) Hofner et al. (1999), (h) Beltrán et al. (2016) – total flux obtained by adding flux from all 1.3 cm continuum sources as provided in their Table 2 and Fig. 1b, S_v is the flux density obtained from Very Large Array (VLA) 1.3 cm observations.

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