Fine-structure excitation of C2O by He: Rate coefficients and astrophysical modeling

Open Access

Fig. 6.

Dependence of the 1₂→0₁ (top) and 2₃→1₂ (bottom) transition intensities (K) on column density (x axis) and n(H₂) (y axis). With dashed black lines, we reproduce the isocurves of the intensities observed by Ohishi et al. (1991), and with dashed white lines the estimated column density ( $N_{C_{2} O} \approx 9 \cdot 10^{11}$ $N_{\mathrm {C_2O}} \approx 9 \cdot 10^{11}$ cm⁻²) for n(H₂) = 7·10³ cm⁻³.

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