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In this letter we report the discovery of CO fluxes, suggesting very high gasfractions in three disk galaxies seen in the nearby Universe (z ~ 0.1). Thesegalaxies were investigated as part of the DYnamics of Newly Assembled MassiveObjects (DYNAMO) survey. High-resolution Hubble Space Telescope imaging ofthese objects reveals the presence of large star forming clumps in the bodiesof the galaxies, while spatially resolved spectroscopy of redshifted Halphareveals the presence of high dispersion rotating disks. The internal dynamicalstate of these galaxies resembles that of disk systems seen at much higherredshifts (1 < z < 3). Using CO(1-0) observations made with the Plateau de BureInterferometer, we find gas fractions of 20-30% and depletion times of tdep ~0.5 Gyr (assuming a Milky Way-like CO conversion factor). These properties areunlike those expected for low- redshift galaxies of comparable specific starformation rate, but they are normal for their high-z counterparts. DYNAMOgalaxies break the degeneracy between gas fraction and redshift, and we showthat the depletion time per specific star formation rate for galaxies isclosely tied to gas fraction, independent of redshift. We also show that thegas dynamics of two of our local targets corresponds to those expected fromunstable disks, again resembling the dynamics of high-z disks. These resultsprovide evidence that DYNAMO galaxies are local analogues to the clumpy,turbulent disks, which are often found at high redshift.

Extreme gas fractions in clumpy, turbulent disk galaxies at z~0.1