# Estimating the Fuel Supply Rate on the Galactic Disk from High Velocity Clouds (HVCs) Infall

## TL;DR

This study revises the estimated fuel supply rate from high velocity clouds to the Galactic disk by incorporating hydrodynamic interactions, revealing that traditional estimates are significantly overestimated.

## Contribution

It introduces new simulation models that account for hydrodynamic effects, providing a more accurate estimate of the HVC infall rate.

## Key findings

- Traditional infall rate overestimated by a factor of ~14.
- Hydrodynamic interactions reduce the estimated fuel supply rate.
- Simulations show the true rate can be as low as 0.072 times the traditional estimate.

## Abstract

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.