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Fig. 16.

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Transition from atomic to molecular hydrogen in MP particles illustrated for the three analysed redshifts as a function of the sub-grid number density of the cold phase. The latter is assumed to have a temperature 300 K hence the pressure is proportional to the number density and shown in the top axis (k is the Boltzmann constant). The colour code shows the mean D/G mass ratio (top panel) and the gas phase metallicity (metals-to-gas mass ratio, bottom panel) of the gas particles falling within each pixel (150 pixels per axis). colour-coded circles represent the median H2 fraction and number density for particles within 0.5 dex bins of log(D/G) (top panel) and log ( Zgas / Z ) $ \rm{log(Zgas/Z_{\odot})} $ (bottom panel). Meanwhile, stars indicate the same, but exclusively for particles in the transition region with H2 fraction between 0.4 and 0.6.

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