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Table 1.
Different spiral arm models tested with our 2D chemical evolution model for the disc, changing the number of spiral arms m (second column), then the pitch angle α (third column), and finally the spiral pattern speed Ωs (last column).
| Models | m | α | Ωs |
|---|---|---|---|
| [km s−1 kpc−1] | |||
| S2A | 2 | 15° | 20 |
| S2B | 2 | 15° | 17.5 |
| S2C | 2 | 15° | 15 |
| S2D | 2 | 15° | 13.75 |
| S2E | 2 | 15° | 12.5 |
| S2F | 2 | 15° | 25 |
| S2G | 2 | 7° | 20 |
| S2H | 2 | 30° | 20 |
| S1A | 1 | 15° | 20 |
| S1B | 1 | 15° | 17.5 |
| S1C | 1 | 15° | 15 |
| S1D | 1 | 15° | 13.75 |
| S1E | 1 | 15° | 12.5 |
| S1F | 1 | 15° | 25 |
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