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Sgr A*, the supermassive black hole (SMBH) in our Galaxy, is dormant today,but it should have gone through multiple gas-accretion episodes in the pastbillions of years to grow to its current mass of $4\times10^6\,M_\odot$. Eachepisode temporarily ignites the SMBH and turns the Galactic Center into anactive galactic nucleus (AGN). Recently, we showed that the AGN could producelarge amount of hard X-rays that can penetrate the dense interstellar medium inthe Galactic plane. Here we further study the impact of the X-rays on themolecular chemistry in our Galaxy. We use a chemical reaction network tosimulate the evolution of several molecular species including H2O, CH3OH, andH2CO, both in the gas phase and on the surface of dust grains. We find that theX-ray irradiation could significantly enhance the abundances of these species.The effect is the most significant in those young, high-density molecularclouds, and could be prominent at a Galactic distance of $8$ kpc or smaller.The imprint in the chemical abundance is visible even several million yearsafter the AGN turns off.

Impact of an Active Sgr A* on the Synthesis of Water and Organic Molecules Throughout the Milky Way