I am mainly studying molecular gas in high redshift quasars, using the cosmological hydrodynamical code GIZMO, coupled to the chemistry package KROME, which can follow the non-equilibrium evolution of multiple chemical species.
I have performed a set of simulations of an isolated high-redshift gas-rich galaxy, following the evolution of molecular gas when star formation, stellar radiation and supernovae are considered.
The figure above shows the total and molecular gas projected density of the galaxy. Most of the molecular gas forms in the dense region of the galaxy spiral arms, while at low density it is dissociated/ionised by the stellar radiation field.
This second figure compares the star formation law relative to total (left-hand panel) and molecular (right-hand panel) gas in the simulation (line contours) to observations of nearby galaxies (Bigiel et al. 2010; Schruba et al. 2011, filled contours; Kennicutt-Schmidt relation, Kennicutt et al. 2007, orange line). The star formation law in the molecular gas component is consistent with the observed data without explicitly assuming a direct correlation between the molecular gas abundance and the star formation rate.