Table 4.
JJ model parameters optimised in this study.
| Parameter | Units | Description | Prior | Standard value | Best value (MCMC1) | Best value (MCMC2) |
|---|---|---|---|---|---|---|
| Σd | M⊙ pc−2 | Thin-disk surface density | 30 ± 3 | 29.4(1) |
 |
 |
| Σt | M⊙ pc−2 | Thick-disk surface density | 5 ± 1.5 | 5.3(1) |
 |
 |
| Σsh | M⊙ pc−2 | Stellar halo surface density for |z|< 2 kpc | 0.6 ± 0.2 | 0.6(5) |
 |
 |
| Σdh | M⊙ pc−2 | DM surface density for |z|< 2 kpc | 50 ± 10 | 59.9(1) |
 |
 |
| σe | km s−1 | AVR scaling factor | 26 ± 3 | 25.75(4) |
 |
 |
| α | AVR power index | 0.4 ± 0.05 | 0.375(1) |
 |
 |
|
| σt | km s−1 | Thick-disk W-velocity dispersion | 45 ± 5 | 45.3(2) |
 |
 |
| σp1 | km s−1 | W-velocity dispersion of the 1st SFRd burst | 25 ± 5 | - |
 |
 |
| σp2 | km s−1 | W-velocity dispersion of 2nd SFRd burst | 15 ± 3 | - |
 |
 |
| ζ | SFRd parameter | 0.8 ± 0.1 | 0.8(4) |
 |
 |
|
| η | SFRd parameter | 5.6 ± 0.1 | 5.6(4) |
 |
 |
|
| Σp1 | M⊙ pc−2 | Amplitude-related parameter of the 1st SFRd burst | |0 ± 4| | - |
 |
 |
| τp1 | Gyr | Mean age of the 1st SFRd burst | 3 ± 1 | - |
 |
 |
| dτp1 | Gyr | Dispersion of the 1st SFRd burst | 0.7 ± 0.15 | - |
 |
 |
| Σp2 | M⊙ pc−2 | Amplitude-related parameter of the 2nd SFRd burst | |0 ± 2| | - |
 |
 |
| τp2 | Gyr | Mean age of the 2nd SFRd burst | 0.5 ± 0.5 | - |
 |
 |
| dτp2 | Gyr | Dispersion of the 2nd SFRd burst | 0.25 ± 0.05 | - |
 |
 |
| α0 | IMF slope for 0.08 M⊙ < m < m0 | 1.25 ± 0.3 | 1.26(3) |
 |
 |
|
| α1 | IMF slope for m0 < m < m1 | 1.5 ± 0.3 | 1.49(3) |
 |
 |
|
| α2 | IMF slope for m1 < m < 6 M⊙ | 3.0 ± 0.3 | 3.02(3) |
 |
 |
|
| m0 | M⊙ | Break point between IMF regimes m−α0 and m−α1 | 0.5 ± 0.15 | 0.5(3) |
 |
 |
| m1 | M⊙ | Break point between IMF regimes m−α1 and m−α2 | 1.4 ± 0.15 | 1.39(3) |
 |
 |
Notes. All values are derived for the Solar circle R⊙. For shortness, two recent episodes of SF enhancement ∼3 Gyr and ∼0.5 Gyr ago correspond to the 1st and 2nd SFRd bursts, respectively. Errors reported in the last two columns are the 16 and 84 percentiles of the parameter PDFs.
References. (1) Paper I; (2) Paper II; (3) Paper III; (4) Updated model feature, the adopted parameter value ensures consistency with (1)–(3); (5) Flynn et al. (2006).
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