Table 4
Results of changing the representation of GMCs from spherical clouds superposed onto an exponential gas disk model (the standard BGC case) to models with clouds surrounded by voids with a subtracted mass from the gas disk equal to the mass of the corresponding clouds.
| Model | σ U8 | σ V8 | σ W8 | f400 [%] |
|
|
||||
| Standard BGS | 37.5 | 18.9 | 16.9 | 1.8 |
| Spherical shielding | 28.4 | 13.4 | 9.1 | <0.2 |
| Cylindrical shielding | 33.1 | 14.8 | 12.9 | 0.5 |
| Dumbbell30 | 30.0 | 15.6 | 10.5 | < 0.2 |
| Dumbbell100 | 30.3 | 15.5 | 12.2 | < 0.3 |
| Cloud displacement | 40.8 | 15.7 | 18.4 | 2.2 |
| Reservoir clouds | 47.9 | 20.6 | 20.0 | 2.9 |
Notes. Data for different cases, with spherical shielding, cylindrical shielding, clouds split into equal components with a mutual distance of 30 or 100 pc, respectively, but with a centre of mass at the centre of the corresponding void (dumbbell30 and dumbbell100), cloud centres displaced relative to the correponding void (cloud displacement), and clouds built on the expence of larger reservoir clouds are presented. The velocity dispersions at the solar circle in km s-1 and the fraction of stars with a distance of >400 pc from the Galactic plane at 4.6 Gyr are given.
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