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Table 1
Model parameters and their meaning.
| Large scale | Disk |
|
|
|
| R | galactic radius |
| v rot | rotation velocity |
| Ω | angular velocity |
| v A,0 | Alfvén velocity |
| M dyn | total enclosed (dynamical) mass |
| M gas | total gas mass |
| v turb | gas turbulent velocity dispersion |
| Q | Toomre parameter |
| ρ | midplane density |
| Σ | surface density |
| H | disk height |
| Ṁ | disk mass accretion rate |
| Ṁ ext | external mass accretion rate |
| Ṁ ∗ | star formation rate |
| ν | gas viscosity |
| l driv | turbulent driving lengthscale |
| ΦV | cloud volume filling factor |
| ΦA | cloud area filling factor |
| ζ | viscosity scaling parameter |
| f | mean fraction of cloud mass |
| participating in collisions | |
| ϑ | disk transparency |
| α | collision coefficient |
| x i | ionization fraction |
| γ | ion-neutral coupling coefficient |
| ζ CR | cosmic ray ionization rate |
| L/M | luminosity to mass ratio |
| λ | compression lengthscale |
| v comp | compression velocity |
|
|
|
| Small scale | Clouds |
|
|
|
| l | size of the C-shock |
| l coll | cloud mean free path |
| M cl | cloud mass |
| r cl | cloud radius |
| l cl | cloud size |
| ρ cl | cloud density |
| N cl | cloud surface density |
| c s | local sound speed within the clouds |
|
cloud free fall time |
| T | temperature |
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