Estimating the Fuel Supply Rate on the Galactic Disk from High Velocity
  Clouds (HVCs) Infall
  Previous studies suggest that the estimated maximum accretion rate from
approaching high velocity clouds (HVCs) on the Galactic disk can be up to ~ 0.4
solar mass per year. In this study, we point out that the hydrodynamic
interaction between the HVCs and the Galactic disk is not considered in the
traditional method of estimating the infall rate and therefore the true supply
rate of fuel from HVCs can be different from the suggested value depending on
the physical configurations of HVCs including density, velocity, and distance.
We choose 11 HVC complexes and construct 4 different infall models in our
simulations to give an idea of how the fuel supply rate could be different from
the traditional infall rate. Our simulation results show that the fuel supply
rate from HVC infall is overestimated in the traditional method and can be
lowered by a factor of ~ 0.072 when the hydrodynamic interaction of the HVC
complexes and the disk is considered.
