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The growth of supermassive black holes, especially the associated state ofactive galactic nuclei (AGNs), is generally believed to be the key step inregulating star formation in massive galaxies. As the fuel of star formation,the cold gas reservoir is a direct probe of the effect of AGN feedback on theirhost galaxies. However, in observation, no clear connection has been foundbetween AGN activity and the cold gas mass. In this paper, we findobservational signals of significant depletion of the total neutral hydrogengas reservoir in optically-selected type-2 AGN host central galaxies of stellarmass $10^{9}$--$10^{10}M_\odot$. The effect of AGN feedback on the cold gasreservoir is stronger for higher star formation rates and higher AGNluminosity. But it becomes much weaker above this mass range, consistent withprevious findings focusing on massive galaxies. Our result suggests thatlow-mass and gas-rich AGN host central galaxies would first form dense coresbefore AGN feedback is triggered, removing their neutral hydrogen gas. Moremassive central galaxies may undergo a significantly different formationscenario by gradually building up dense cores with less effective and recurrentAGN feedback.

Cold Gas Reservoirs of Low- and High-mass Central Galaxies Differ in Response to Active Galactic Nucleus Feedback