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We present the Evolution of molecular Gas in Normal Galaxies (EGNoG) survey,an observational study of molecular gas in 31 star-forming galaxies from z=0.05to z=0.5, with stellar masses of (4-30)x10^10 M_Sun and star formation rates of4-100 M_Sun yr^-1. This survey probes a relatively un-observed redshift rangein which the molecular gas content of galaxies is expected to have evolvedsignificantly. To trace the molecular gas in the EGNoG galaxies, we observe theCO(1-0) and CO(3-2) rotational lines using the Combined Array for Research inMillimeter-wave Astronomy (CARMA). We detect 24 of 31 galaxies and presentresolved maps of 10 galaxies in the lower redshift portion of the survey. Weuse a bimodal prescription for the CO to molecular gas conversion factor, basedon specific star formation rate, and compare the EGNoG galaxies to a largesample of galaxies assembled from the literature. We find an average moleculargas depletion time of 0.76 \pm 0.54 Gyr for normal galaxies and 0.06 \pm 0.04Gyr for starburst galaxies. We calculate an average molecular gas fraction of7-20% at the intermediate redshifts probed by the EGNoG survey. By expressingthe molecular gas fraction in terms of the specific star formation rate andmolecular gas depletion time (using typical values), we also calculate theexpected evolution of the molecular gas fraction with redshift. The predictedbehavior agrees well with the significant evolution observed from z~2.5 totoday.

The EGNoG Survey: Molecular Gas in Intermediate-Redshift Star-Forming Galaxies