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Table 7
Velocity dispersions, asymmetric drift Vad at the solar position, and velocity dispersion gradient.
| Age | σ U | σ V | σ W | V ad | |
| (Gyr) | (km s-1) | (km s-1) | (km s-1) | (km s-1) | |
|
|
|||||
| Thin disc | 0–0.15 | 16.7 | 10.8 | 6 | 3.5 |
| 0.15–1 | 19.8 | 12.8 | 8 | 3.1 | |
| 1–2 | 27.2 | 17.6 | 10 | 5.8 | |
| 2–3 | 30.2 | 19.5 | 13.2 | 7.3 | |
| 3–5 | 36.7 | 23.7 | 15.8 | 10.8 | |
| 5–7 | 43.1 | 27.8 | 17.4 | 14.8 | |
| 7–10 | 43.1 | 27.8 | 17.5 | 14.8 | |
| Thick disc | 11 | 67 | 51 | 42 | 53 |
| Spheroid | 14 | 131 | 106 | 85 | 226 |
| Bulge | 10 | 113 | 115 | 100 | 79 |
Notes. The W axis is pointing towards the north galactic pole, U towards the galactic centre, and V is tangential to the rotational motion.
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