Chemistry and ro-vibrational excitation of CH+ in the planetary nebula NGC 7027

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Volume 709 (May 2026)

A&A, 709 (2026) A271

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Table 5

Summary of the initial priors and best-fit posterior physical parameters obtained from the RADEX/MCMC model (taking into account all rotational and ro-vibrational detected CH⁺ lines) with chemical pumping (see Fig. E.1).

Parameters	Units	Initial priors	Prior intervals	Best-fit posteriors
T_kin	K	1250	30–2000	${1258.61}_{- 11.22}^{+ 11.40}$ $Mathematical equation: $\[1258.61_{-11.22}^{+11.40}\]$$
n(e⁻)	cm⁻³	1.00 × 10²	10–10⁵	${5.89}_{- 0.27}^{+ 0.28}$ $Mathematical equation: $\[5.89_{-0.27}^{+0.28}\]$$ × 10³
n(H)	cm⁻³	1.00 × 10⁶	10³–10⁷	${1.62}_{- 0.17}^{+ 0.16}$ $Mathematical equation: $\[1.62_{-0.17}^{+0.16}\]$$ × 10⁵
N[CH⁺]	cm⁻²	10¹⁵	10¹³–10¹⁶	${1.48}_{- 0.03}^{+ 0.03}$ $Mathematical equation: $\[1.48_{-0.03}^{+0.03}\]$$ × 10¹⁴

Notes. The uncertainties quoted represent the 16th and 84th percentiles (equivalent to a 1σ for a Gaussian distribution).

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