Reconstructing the Milky Way chemical map with the galactic chemical evolution tool OMEGA+ from SDSS-MWM

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Table 1

List of the GCE parameters.

Symbol	Definition	Fitting value or range
ν	Star formation efficiency, SFE	0.022
η	Mass-loading factor	1
t_β (Gyr)	Characteristic decay time in the delay-time distribution of SNe Ia	2
N_Ia/M_⊙	Number of SNe Ia per stellar mass formed in a simple stellar population	0.0020
M_trans (M_⊙)	Initial mass, which marks the transition from AGB to massive stars	9
t_max,1 (Gyr)	Time of the first infall event	0.10
t_max,2 = t_max (Gyr)	Time of the second infall event	[1,12]
τ₁ (Gyr)	Characteristic time of the accretion after the first infall event	[0,7]
τ₂ (Gyr)	Characteristic time of the accretion after the second infall event	[0,10]
$τ_{1}^{'} (G y r)$ $\[\tau_{1}^{\prime}~(\mathrm{Gyr})\]$	Characteristic rising time of accretion before the first infall event	0.05
$τ_{2}^{'} = τ_{up} (G y r)$ $\[\tau_{2}^{\prime}=\tau_{\text {up }}(\mathrm{Gyr})\]$	Characteristic rising time of accretion before the second infall event	[0,5]
σ₁ (M_⊙ pc⁻²)	Surface mass density of the gas accreted during the first infall event	σ₂/σ₁ = [0.1,50]
σ₂ (M_⊙ pc⁻²)	Surface mass density of the gas accreted by the merger event	σ₁ + σ₂ =[20,500]

Notes. The third column contains the fixed value or the fitting range of each parameter.

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