Table 8
Test with two thick-disc episodes.
| Old thick disc | 12 Gyr | 12 Gyr | 12 Gyr | 11 Gyr |
| Young thick disc | – | 11 Gyr | 10 Gyr | 10 Gyr |
|
|
||||
| scale height (pc) | 465. | 826. | 795. | 824. |
| – | 359. | 345. | 348. | |
|
|
||||
| scale length (pc) | 2305. | 3077. | 2919. | 2907 |
| – | 1986. | 2040. | 2089. | |
|
|
||||
| normalisation | 1.55 | 0.21 | 0.25 | 0.19 |
| – | 1.54 | 1.63 | 1.65 | |
|
|
||||
| flare start radius (pc) | 9359. | 10 020. | 9543 | 9757 |
| – | 17 364 | 15 340. | 14 400. | |
|
|
||||
| flare slope (pc/kpc) | 0.187 | 0.09 | 0.06 | 0.09 |
| – | 0.02 | 0.06 | –0.08 | |
|
|
||||
| Lr | –66 085. | –60 360. | –59 077 | –61 015 |
| BIC | 132 035 | 120 566. | 118 000. | 121 876 |
Notes. Parameters are compared for a single episode (2nd column), two episodes with different ages (Cols. 3 to 5) obtained with a free Hernquist halo and a thick disc with shape B (sech2). For each parameter the first line is for the older thick-disc episode and the second line for the younger thick-disc episode.
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