Contribution of supernovae-driven galactic fountain on fuel rate

Abstract

The interstellar medium in our galaxy is a complex system which involves multiphase gas in a wide range of temperatures and densities. Accompanied by physical processes such as cooling, gravity and magnetic fields it is known that the supernovae blast waves can reshuffle the ISM by generating a galactic fountain. In our study, we mainly focus on estimating the fuel rate of the fountain which is defined as the supply rate of material from the gas falling back into the galactic disk. We take into account the effect of cooling by combining the use of non-equilibrium ionization (NEI) and collisional ionization equilibrium (CIE). Dealing with cooling in this manner, we aim to reduce computation time by using a prebuilt CIE cooling table at applicable physical conditions instead of constantly considering time dependent ion fractions for NEI cooling.