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Fig. 5.


Molecular mass ratio from IRAM observations (blue leftward-pointing triangles) and those based on extrapolation of the CO measurements assuming a constant Hα-to-CO flux ratio (red stars; see text for details) over total molecular masses from ALMA. The IRAM measurements are taken from Edge (2001), Salomé & Combes (2003) and Pulido et al. (2018). The measured and expected mass of the molecular gas in RXJ0821+0752 is almost the same. Indeed the ratio of expected to measured molecular mass from ALMA and IRAM is close to unity, between 1.2 and 1.4, suggesting that ALMA has detected a significant fraction of the molecular mass. These mass comparisons are all based on the same fluxes, and therefore are not affected by the CO-to-H2 conversion factor.

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