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A decade of study has established that the molecular gas properties ofstar-forming galaxies follow coherent scaling relations out to z~3, suggestingremarkable regularity of the interplay between molecular gas, star formation,and stellar growth. Passive galaxies, however, are expected to be gas-poor andtherefore faint, and thus little is known about molecular gas in passivegalaxies beyond the local universe. Here we present deep Atacama LargeMillimeter/submillimeter Array (ALMA) observations of CO(2-1) emission in 8massive (Mstar ~ 10^11 Msol) galaxies at z~0.7 selected to lie a factor of 3-10below the star-forming sequence at this redshift, drawn from the Large EarlyGalaxy Astrophysics Census (LEGA-C) survey. We significantly detect half thesample, finding molecular gas fractions <~0.1. We show that the molecular andstellar rotational axes are broadly consistent, arguing that the molecular gaswas not accreted after the galaxies became quiescent. We find that scalingrelations extrapolated from the star-forming population over-predict both thegas fraction and gas depletion time for passive objects, suggesting theexistence of either a break or large increase in scatter in these relations atlow specific star formation rate. Finally, we show that the gas fractions ofthe passive galaxies we have observed at intermediate redshifts are naturallyconsistent with evolution into local massive early-type galaxies by continuedlow-level star formation, with no need for further gas accretion or dynamicalstabilization of the gas reservoirs in the intervening 6 billion years.

Molecular Gas Contents and Scaling Relations for Massive Passive Galaxies at Intermediate Redshifts from the LEGA-C Survey