Table 1
Timescales to leave arms or interarms for different stellar ages and radii.
| <5 Myr | 1–3 Gyr | 5–7 Gyr | ||||
|---|---|---|---|---|---|---|
| Arm | Inter | Arm | Inter | Arm | Inter | |
| 4–6 kpc | 141 | 48 | 65 | 51 | 42 | 41 |
| 6–8 kpc | 158 | 73 | 90 | 58 | 53 | 45 |
| 8–10 kpc | 184 | 68 | 96 | 61 | 56 | 47 |
Notes. Timescales (in Myr) to reduce from 100% to 10% the number of stars initially selected within the arms and in interarms (labelled ‘inter’) at times between 8.25 and 8.75 Gyr. Rows give the values for different galactocentric rings and each pair of columns indicates a population with a different age. Uncertainties are of the order of 5–20 Myr, mainly depending on age and whether the initial selection is in arms or in interarms (Fig. 10).
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