The H$_{2}$ density within spiral and irregular galaxies at high redshift: estimating CO detection limits

We have computed a grid of chemical evolution models for a large set of spiral and irregular theoretical galaxies of different total mass. In our models, the gas phase has two components, the diffuse and the molecular one ($\rm H_{2}$). It is possible, therefore, to follow the time (or redshift) evolution of the expected density of the $\rm H_{2}$ phase. We will show the predictions of this gas density at hight redshift, which might be detected with ALMA, in this type of galaxies.

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