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Residual star formation at late times in early-type galaxies and theirprogenitors must be suppressed in order to explain the population of red,passively evolving systems we see today. Likewise, residual or newly accretedreservoirs of molecular gas that are fuelling star formation must be destroyed.This suppression of star formation in early-type galaxies is now commonlyattributed to AGN feedback wherein the reservoir of gas is heated and expelledduring a phase of accretion onto the central supermassive black hole. However,direct observational evidence for a link between the destruction of thismolecular gas and an AGN phase has been missing so far. We present newmm-wavelength observations from the IRAM 30m telescope of a sample of lowredshift SDSS early-type galaxies currently undergoing this process ofquenching of late-time star formation. Our observations show that thedisappearance of the molecular gas coincides within less than 100 Myr with theonset of accretion onto the black hole and is too rapid to be due to starformation alone. Since our sample galaxies are not associated to powerfulquasar activity or radio jets, we conclude that low-luminosity AGN episodes aresufficient to suppress residual star formation in early-type galaxies. This`suppression mode' of AGN feedback is very different from the `truncation mode'linked to powerful quasar activity during early phases of galaxy formation.

Destruction of Molecular Gas Reservoirs in Early-Type Galaxies by Active Galactic Nucleus Feedback