The Effect of a Quasi-stellar Object on Its Host Galaxy: Dynamical and Physical Processes in the Interstellar Medium around a Quasi-stellar Object

The dynamical and physical processes in the ISM around a QSO have been calculated in order to understand the effects of QSO radiation on the host galaxy. Numerical hydrodynamical solutions for one- and two-dimensional cases are found through a MacCormack differencing scheme. Ion-field emission, ion sputtering, charge equilibrium, thermal equilibrium, coupling between gas ions and dust grains, photoionization, and photoelectrical processes are considered. The results show that dust grains play an important role in determining the dynamics of the ISM around a QSO. Inside 7 kpc, all dust grains are destroyed in about 30 million yr. Gas goes to large distances in the galactic plane and leaves the galaxy.