Table 6
The χ2 tests for eleven model ingredients with respect to the Tycho-2 data.
| The minimum | χ2 test with | ||||||
| χ2 method | scaling factors | ||||||
|
|
|||||||
| Model | Field | Option (1) | Option (2) | χ 2 | χ 2 | χ 2 | χ 2 |
| ingredients | (1)-T | (2)-T | (1)-T | (2)-T | |||
|
|
|||||||
| IMF | 1 | Kroupa (2008) | Kroupa-Haywood v.6 | 140 | 42 | 39 | 14 |
| SFR | 1 | constant | decreasing (*) | 171 | 42 | 31 | 14 |
| thin disc age | 1 | 9 Gyr | 10 Gyr | 51 | 42 | 16 | 14 |
| 1 | 12 Gyr | 10 Gyr | 40 | 42 | 14 | 14 | |
| age–metallicity relation | 3 | Twarog (1980) | Haywood (2006) | 11 | 4 | 6 | 2 |
| age–velocity relation | 3 | Holmberg et al. (2009) | Gómez et al. (1997) | 11 | 4 | 4 | 2 |
| thick disc | 3 | model TkD1 | model TkD2 | 12 | 4 | 3 | 2 |
|
|
|||||||
| binarity | 1 | no | yes | 76 | 42 | 21 | 14 |
| evolutionary tracks | 1 | package E1 | package E2 | 50 | 42 | 18 | 14 |
| atmosphere models | 2 | BaSeL 2.2 | BaSeL 3.1 | 23 | 9 | 11 | 3 |
| ISM | 3 | 0.02 M⊙ pc-3 | 0.05 M⊙ pc-3 | 6 | 4 | 3 | 2 |
|
|
|||||||
| extinction model: | |||||||
| model A | GPlane | Drimmel & Spergel (2001) | Marshall et al. (2006) | 127 | 418 | 52 | 92 |
| model B | GPlane | Drimmel & Spergel (2001) | Marshall et al. (2006) | 153 | 998 | 82 | 143 |
| radial scale length | GC | model SL1 | model SL2 | 29 | 49 | 17 | 18 |
| GA | model SL1 | model SL2 | 49 | 27 | 20 | 15 | |
| GR | model SL1 | model SL2 | 22 | 22 | 20 | 19 | |
Notes. In each case, the simulations were done towards one of the three reference regions: 1-Galactic plane, 2-intermediate latitudes and 3-Galactic pole or towards a special region. In the case of the extinction models, a bigger stripe within the Galaxy plane (GPlane) was chosen for analysis (| l | < 100 and | b | < 10). The radial scale length was tested towards the 3 cardinal directions: Galaxy centre (GC), anticentre (GA), and rotation (GR). The symbol (*) is a decreasing SFR from Aumer & Binney (2009).
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