We suggest that turbulent heating, wave pressure and gas exchanges via fountains and bubbles may determine the self-similar structure of gas-rich galaxy disks on large scales. We have constructed simple,analytic models in which hydrodynamic forces, star formation rates and phase balances are all tightly coupled and balanced. These models generally include slow radial flows, inflow for cold gas in the midplane, and outflow for the warm-to-hot phase surrounding the midplane. The models readily account for the slowed rotation of gas out of the midplane in NGC 891. They also show how the Schmidt Law and the universal structure of gas surface density profiles result from thermo-hydrodynamic self-regulation in late-type galaxy disks.
American Astronomical Society Meeting Abstracts #194
- Pub Date:
- September 1999