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We carried out 12CO(J=2-1) observations toward three star-forming galaxies onthe main sequence at z~1.4 with the Nobeyama 45m radio telescope. Thesegalaxies are detected with Spitzer/MIPS in 24 um, Herschel/SPIRE in 250 um and350 um, and their gas metallicity, derived from optical emission line ratiosbased on near infrared spectroscopic observations, is close to the solarmetallicity. Although weak signal-like features of CO were seen, we could notdetect significant CO emission. The dust mass and the upper limits on themolecular gas mass are (3.4-6.7) x 10^{8} Msun and (9.7-14) x 10^{10} Msun,respectively. The upper limits on the gas-to-dust ratios at z~1.4 are 150-410which are comparable to the gas-to-dust ratios in local galaxies with similargas metallicity. A line stacking analysis enables us to detect a significant COemission and to derive an average molecular gas mass of 1.3 x 10^{11} Msun andgas-to-dust ratio of 250. This gas-to-dust ratio is also near that in localgalaxies with solar metallicity. These results suggest that the gas-to-dustratio in star-forming galaxies with solar metallicity does not evolvesignificantly up to z~1.4. By comparing to a theoretical calculation, a rapidincrease of the dust mass in an earlier epoch of galaxy evolution is suggested.

Constraint on the Gas-to-Dust Ratio in Massive Star-Forming Galaxies at z~1.4