PDRs4All - XI. Detection of infrared CH+ and CH3+ rovibrational emission in the Orion Bar and disk d203-506: Evidence of chemical pumping

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Fig. E.2

(a): (Top) ${C H}_{3}^{+}$ $\mathrm{CH}_{3}^{+}$ continuum subtracted spectra in DF3 (see Fig. 1). (Bottom) LTE model of ${C H}_{3}^{+}$ $\mathrm{CH}_{3}^{+}$ at T = 1200 K and $N_{vib} ({C H}_{3}^{+}) = 1.7 \times 10^{10}$ $N_{\text {vib}}\left(\mathrm{CH}_{3}^{+}\right)=1.7 \times 10^{10}$ cm⁻². (b): (Top) ${C H}_{3}^{+}$ $\mathrm{CH}_{3}^{+}$ continuum subtracted spectra in d203-506 (see Fig. 1). (Bottom) LTE model of ${C H}_{3}^{+}$ $\mathrm{CH}_{3}^{+}$ at T = 700 K and $N_{vib} ({C H}_{3}^{+}) = 5 \times 10^{11}$ $N_{\text {vib}}\left(\mathrm{CH}_{3}^{+}\right)=5 \times 10^{11}$ cm⁻² (Berné et al. 2023; Changala et al. 2023).

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