Table 5
Most important ingredients of the old and new model, which have been analysed.
Ingredients | Old model | New default models | |
model A | model B | ||
|
|||
IMF | Haywood-Robin | Haywood-Robin (A) | Kroupa-Haywood v6 (B) |
SFR | constant | a decreasing exp( − 0.12τ) | a decreasing exp( − 0.12τ) |
Aumer & Binney (2009) | Aumer & Binney (2009) | ||
evolutionary | see Table 2 | package E2 Table 2 | package E2 Table 2 |
tracks | |||
age–metallicity | Twarog (1980) | Haywood (2006) | Haywood (2006) |
relation | |||
atmosphere | BaSeL 2.2 | BaSeL 3.1 | BaSeL 3.1 |
models | |||
binarity | no | yes: from Arenou (2011) | yes: from Arenou (2011) |
thin disc age | 10 Gyr | 10 Gyr | 10 Gyr |
thick disc | xl = 400 pc, hz = 800 pc | xl = 400 pc, hz = 800 pc | xl = 400 pc, hz = 800 pc |
parameters | density = 0.0083 */pc3 | density = 0.0083 */pc3 | density = 0.0083 */pc3 |
extinction | Drimmel & Spergel (2001) | Drimmel & Spergel (2001) | Drimmel & Spergel (2001) |
model | + Marshall et al. (2006) | + Marshall et al. (2006) | |
ISM local | Robin et al. (2003) | Binney & Tremaine (2008) | Binney & Tremaine (2008) |
density | |||
local stellar | Wielen (1974) | Wielen (1974) | Jahreiß & Wielen (1997) |
mass density | |||
age–velocity | Gómez et al. (1997) | Gómez et al. (1997) | Gómez et al. (1997) |
relation | |||
warp | Reylé et al. (2009) | Reylé et al. (2009) | Reylé et al. (2009) |
scale length | young disc hR = 5000.0 pc | young disc hR = 5000.0 pc | young disc hR = 5000.0 pc |
old disc hR = 2400.0 pc | old disc hR = 2400.0 pc | old disc hR = 2400.0 pc |
Notes. Notice that the two default models differ only by the IMF and the value of the local stellar mass density. The Drimmel & Spergel (2001) extinction model was not used in the BGM from Robin et al. (2003), but it was used here in the old model simulations.
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