Unification Model of Active Galactic Nuclei by Photoionization Equilibrium Calculation Based on Radiative Hydrodynamic Simulations

Abstract To investigate the origin of the dependence of the covering factor on the Eddington ratio suggested by X-ray observations, we examined the angular distribution of H i and H ii based on two-dimensional radiative hydrodynamic simulations. To calculate the Compton-thin covering factor C 22 and Compton-thick covering factor C 24 of H i alone, we performed one-dimensional photoionization equilibrium calculations with the XSTAR code based on radiative hydrodynamic simulations. The results obtained are as follows. (1) The Compton-thin covering factor C 22 of H i and H ii is independent of the Eddington ratio and is approximately 70%, while C 22 of H i alone is also independent of the Eddington ratio and is approximately 30%. (2) The Compton-thick covering factor C 24 of H i has the same value as C 22 of H i . (3) Our C 24 is consistent with that obtained from X-ray observations. (4) Our C 22 agrees with that obtained from X-ray observations in a high Eddington ratio, while our C 22 is smaller than that from X-ray observations in a low Eddington ratio. (5) To explain the difference between C 22 obtained from theoretical calculations and that inferred from X-ray observations, a Compton-thin gas is required in regions extending at least 10 pc beyond the current computational regions.