Study of Multiphase Interstellar Matter in a Gas Rich Dwarf Galaxy
Abstract
Because of limitations in numerical resolution of cosmological galaxy formation simulations, previous studies can not consider multiphase structures of the ISM which should strongly affect galaxy properties. For instance, the size of disk galaxies formed in numerical simulations is smaller than that of observed galaxies.
In this study, by increasing the numerical resolution, we take into account the multiphase structure of ISM produced by radiative cooling, UV heating and supernova feedback. We simulate evolutions of multiphase ISM in a gas-rich dwarf galaxy, and obtain various aspects corresponding to gas-rich dwarf galaxies, especially, giant molecular cloud associations and superbubbles produced by subsequent supernovae. The cloud mass function in our models has a power law form with index α ∼-1.7 which agrees well with the observed values α ∼ -1.5 to -2.0. The bubble size approximately corresponds to the scale height of a warm (103 K< T<104 K) disk. Our numerical results show that feedback by SNe plays a very important role in regulation of ISM evolution in a gas-rich dwarf galaxy.- Publication:
-
8th Asian-Pacific Regional Meeting, Volume II
- Pub Date:
- 2002
- Bibcode:
- 2002aprm.conf..289S