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Fig. 3.


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[K km s−1 pc2] ratios as a function of LIR. Clockwise, from top left: CO (5 − 4), CO (7 − 6), [C I](3P13P0), and [C I](3P2  −  3P1). D49 is shown as a red star, BX610 as a turquoise diamond, NGC 6240 as a purple square, and MD94 as a green triangle. The blue and orange points are respectively from the local and high-redshift galaxy samples in Valentino et al. (2020), green points are the samples from Boogaard et al. (2020), and pink points are from Valentino et al. (2021). BX610 and MD94 are not shown in the CO (5 − 4)–IR plane (top left) due to lack of CO (5 − 4) observations. The black dashed and grey lines indicate the best fit in the space and random sampling of the posterior distribution. Two galaxies in Valentino et al. (2021) are found to have high ratios (pink down-pointing triangles in the upper left panel), both of which are also found to have strong AGN signatures (fAGN ∼ 0.9). Three galaxies in Boogaard et al. (2020) are found to have high /LIR ratios (green down-pointing triangles in the upper right panel, one of which is obscured by purple square). AGN signatures are detected in two of them (fAGN ∼ 0.08), while the other one, with the highest /LIR ratio, is labelled as a non-AGN.

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