Rotational equilibrium of C2 in diffuse interstellar clouds - II. Formation-excitation at work?

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Table 1

Derived physical parameters.

LoS	T (K)	n_H cm⁻³	G	k_f s⁻¹
Cyg OB2-12	34.7	24.1	0.27	5.6 10⁻¹²
	40 $_{- 3}^{+ 4}$ $^{+4}_{-3}$	82 $_{- 1}^{+ 2}$ $^{+2}_{-1}$	1.0	0
HD 29647	12.0	70.7	0.48	6 10⁻¹²
	10 $_{- 1}^{+ 2}$ $^{+2}_{-1}$	122 $_{- 6}^{+ 8}$ $^{+8}_{-6}$	1.0	0
HD 24534	38.0	42.0	0.7	–
	46 $_{- 7}^{+ 9}$ $^{+9}_{-7}$	70 $_{- 6}^{+ 4}$ $^{+4}_{-6}$	1.0	0

Notes. The first line is the present derivation and the second line shows the values deduced in Neufeld et al. (2024). Note that n_H and G are degenerate for HD 29647 and HD 24534 (see text).

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