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In the disks of four jellyfish galaxies from the GASP sample at redshift$\sim 0.05$ we detect molecular gas masses systematically higher than in fieldgalaxies. These galaxies are being stripped of their gas by ram pressure fromthe intra cluster medium and are, in general, forming stars at high rate withrespect to non-stripped galaxies of similar stellar masses. We find that,unless giant molecular clouds in the disk are unbound by ram pressure leadingto exceptionally high CO--to--$\rm H_2$ conversion factors, these galaxies havea molecular gas content 4-5 times higher than normal galaxies of similarmasses, and molecular gas depletion times ranging from $\sim$1 to 9 Gyr,corresponding to generally very low star formation efficiencies. The moleculargas mass within the disk is a factor between 4 and $\sim$100 times higher thanthe neutral gas mass, as opposed to the disks of normal spirals that containsimilar amounts of molecular and neutral gas. Intriguingly, the molecular plusneutral total amount of gas is similar to that in normal spiral galaxies ofsimilar stellar mass. These results strongly suggest that ram pressure in disksof galaxies during the jellyfish phase leads to a very efficient conversion ofHI into $\rm H_2$.

The high molecular gas content, and the efficient conversion of neutral into molecular gas, in jellyfish galaxies