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Table 1
Disc parameters of the best fit (see text).
| Parameter | All data, no grad. metal. | | φ | ≤ 30°, no grad. metal. | All data, with grad. metal. |
|
|
|||
| hr,thin (kpc) |
|
2.1 | 2.0 |
| hz,thin(R⊙) (kpc) |
|
0.28 | 0.21 |
| hr,thick (kpc) |
|
2.5 | 2.7 |
| hz,thick(R⊙) (kpc) |
|
0.60 | 0.55 |
|
|
|||
| k1,thin (kpc-1) | –0.037 | 0.090 | –0.190 |
| k2,thin (kpc-2) | 0.052 | 0.043 | 0.070 |
| k1,thick (kpc-1) | 0.021 | 1.448 | 0.000 |
| k2,thick (kpc-2) | 0.006 | –0.055 | 0.010 |
| Rft (kpc) |
|
15.8 | 6.9 |
|
|
|||
| hz,thin(15 kpc) /hz,thin(R⊙) | 3.3 |
3.7 | 3.1 |
| hz,thin(20 kpc) /hz,thin(R⊙) | 8.1 |
8.3 | 8.8 |
| hz,thin(25 kpc) /hz,thin(R⊙) | 15.5 |
14.9 | 17.8 |
| hz,thick(15 kpc) /hz,thick(R⊙) | 1.5 |
1.0 | 1.6 |
| hz,thick(20 kpc) /hz,thin(R⊙) | 2.3 |
6.1 | 2.7 |
| hz,thick(25 kpc) /hz,thick(R⊙) | 3.4 |
9.6 | 4.2 |
Notes. There are nine independent parameters in the fit; the last six parameters depend on the previous ones. The constraint | φ | ≤ 30° explores the region where the warp amplitude is very low. The metallicity gradient is modelled following Eq. (6).
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