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One of the most important questions in astrophysics is what causes galaxiesto stop forming stars. Previous studies have shown a tight link betweenquiescence and black hole mass. Other studies have revealed that quiescence isalso associated with 'starvation', the halting of gas inflows, which results inthe remaining gas being used up by star formation and in rapid chemicalenrichment. In this work, we find the missing link between these two findings.Using a large sample of galaxies, we uncover the intrinsic dependencies of thestellar metallicity on galaxy properties. In the case of star-forming galaxies,stellar metallicity is primarily driven by stellar mass. However, for passivegalaxies, the stellar metallicity is primarily driven by the stellar velocitydispersion. The latter is known to be tightly correlated with black hole mass.This result can be seen as connecting previous studies, where the integratedeffect of black hole feedback (i.e. black hole mass, traced by the velocitydispersion) prevents gas inflows, starving the galaxy, which is seen by therapid increase in the stellar metallicity, and leading to the galaxy becomingpassive.

Different regulation of stellar metallicities between star-forming and quiescent galaxies -- Insights into galaxy quenching