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Table 1.
Input parameters for different models.
| Model | e-folding time in infall law | Delay time for infall | Star formation efficiency | gwIMF |
|---|---|---|---|---|
| (τ1, τ2 or τ [Gyr]) | (tmax [Gyr]) | (ν or  [Gyr−1]) |
||
| Two-infall, thick disc (classical) | 1.0 | – | 2.0 | Canonical (a) |
| Two-infall, thin disc (classical) | 7.0 | 1.0 | 1.0 | Canonical (a) |
| Two-infall, thick disc (revised) | 0.1 | – | 1.3 | Canonical (a) |
| Two-infall, thin disc (revised) | 8.0 | 4.3 | 1.3 | Canonical (a) |
| Parallel, thick disc | 0.5 | – | 2.0 | Canonical (a) |
| Parallel, thin disc | 7.0 | – | 1.0 | Canonical (a) |
| Galactic bulge | 0.1 | – | 25.0 | Salpeter (b) |
| Prototype elliptical galaxy | 0.05 | – | 1.8 | Top-heavy (c) |
Notes.
(a)
Kroupa (2002) IMF with x = 1.7 in the high-mass domain (x = 1.35 for Salpeter IMF).
(b)
Extrapolated Salpeter (1955) slope over the whole mass range.
(c)
Slope flatter than Salpeter’s, x = 1.1, in the high-mass range (see Zhang et al. 2018; Romano et al. 2019).
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