Revisiting rotationally excited CH at radio wavelengths: A case study towards W51

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Table 4

Physical conditions modelled using MOLPOP-CEP non-LTE radiative transfer analysis towards different velocity components in W51E.

Velocity component	\|R_i\|	log₁₀(n_H/[cm⁻³])	T_kin
[km s⁻¹]			[K]
51	25.2	${5.32}_{- 0.44}^{+ 0.18}$ $\[5.32_{-0.44}^{+0.18}\]$	$63_{- 12.0}^{+ 10.0}$ $\[63_{-12.0}^{+10.0}\]$
	22.8
57	1.8
	8.6	${5.02}_{- 0.20}^{+ 0.26}$ $\[5.02_{-0.20}^{+0.26}\]$	$72_{- 19.0}^{+ 8.0}$ $\[72_{-19.0}^{+8.0}\]$
	1.8
61	1.5
	1.0	${5.3}_{- 0.14}^{+ 0.10}$ $\[5.3_{-0.14}^{+0.10}\]$	$27_{- 5.0}^{+ 4.0}$ $\[27_{-5.0}^{+4.0}\]$
	4.1
65	1.2
	7.3	${3.25}_{- 0.12}^{+ 0.08}$ $\[3.25_{-0.12}^{+0.08}\]$	≥178
	1.5
67	−
	2.8	${2.49}_{- 0.17}^{+ 0.22}$ $\[2.49_{-0.17}^{+0.22}\]$	≥172
	1.6

Notes. The columns are from left to right: the velocity component modelled, the observed line ratios (R_i) where each row corresponds to R₁ = T_{3.264 GHz}/T_{3.349 GHz}, R₂ = T_{3.335 GHz}/T_{3.349 GHz}, and R₃ = T_{701 MHz}/T_{724 MHz} (where detected), the modelled gas densities and temperatures alongside their 2σ errors.

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