Table 3
Parameters for a thick disc of shape B.
| Parameter | Min | Max | Best | St Dev |
|
|
||||
| Halo | ||||
| exponent | 2.2 | 4.5 | 3.351 | 0.01 |
| axis ratio | 0.3 | 1.2 | 0.700 | 0.01 |
| normalisation | 0. | 5. | 3.28 | 0.01 |
|
|
||||
| Thick disc | ||||
| IMF | –1. | 1. | –0.32 | 0.02 |
| scale height (pc) | 400 | 1300 | 470.0 | 0.7 |
| normalisation | 0. | 3. | 1.54 | 0.03 |
| scale length (pc) | 1500 | 5000 | 2377. | 8.2 |
| flare start radius (pc) | 7000 | 20000 | 13242. | 1352. |
| flare slope (pc/kpc) | –0.3 | 0.3 | 0. | 0.11 |
|
|
||||
| Lr | –67788. | 232. | ||
| BIC | 135662. | |||
Notes. Fitted model parameters, range explored (2nd and 3rd column), best-likelihood value (4th column) and standard deviation (5th column) for the thick disc of shape B, an age of 12 Gyr, and a metallicity of z = 0.003. The halo is assumed to be a single power-law. BIC is −2 ∗ Lr + k ∗ ln(n) as explained in the text.
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