Ratio of gas over baryon content (top panels) within 2Reff as a function of galaxy stellar mass at different redshifts for the cold dense star-forming gas with density higher than 0.1 or 10 cm−3 (left and right, respectively) and temperature lower than 2 × 104 K, and the ratio of this cold selected gas over total gas (bottom panels). The solid lines indicate the mean values, and the dashed lines stand for the error on the mean. The points with error bars correspond to the observations from Santini et al. (2014; sampled from their interpolated curves in their Fig. 12) at various redshifts and from Catinella et al. (2018) from local galaxies for the HI+H2 gas, while the dotted line shows the data from Tacconi et al. (2018) at various redshifts for the H2 molecular gas only. The NEWHORIZON galaxies are less gas-rich at the high-mass end and also at lower redshift for a given stellar mass, in qualitative agreement with the data. But they show significantly less gas at the low-mass end compared to observations, and especially at high redshift with the data from Tacconi et al. (2018), and in contrast they are in good agreement with the data from Santini et al. (2014).
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