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We use the Horizon Run 5 cosmological simulation to study the effect ofgalaxy intrinsic properties and the local environment on AGNs characterized bytheir threshold of the accretion rate. We select galaxies in the stellar massrange $10^{9.5} \le M^{}{*}/M^{}{\odot} \le 10^{10.5}$ in the snapshot atredshift $z$=0.625. Among various intrinsic properties, we find that the starformation rate of the host galaxy is most correlated to the AGN activity. Toquantify the environment, we use background galaxy number density (large-scaleenvironment) and distance and morphological type of the nearest neighbors(small-scale environment), and study their relative effects on the AGNproperties. We find that, compared to the background density, the nearestneighbor environment is the dominant quantity determining the bolometricluminosity, star formation rate, and kinematic properties of AGNs and betterdictates the gas mass of the host galaxy. We show that the cold gas content inthe host galaxies is crucial in triggering AGN activity. However, when thenearest neighbor environment effects start to act at the neighbor distance ofless than about half the virial radius of the neighbor, the neighborenvironmental effects are the most dominant factor for quasar activity.

On the Effects of Local Environment on Active Galactic Nucleus (AGN) in the Horizon Run 5 Simulation