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

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Table 3

Results for the global and regional fits.

Zone	Inner		Middle		Outer		This model	Ref. (S21)

Region	R₁	R₂	R₃	R₄	R₅	R₆	Global	Global
Distance (kpc)	3–5	5–7	7–9	9–11	11–13	13–15	3–15	2–14
N_⋆	20 255	48 802	171 134	100 054	39 531	13 967	393 743	26 690
t_max (Gyr)	4.55 ± 0.11	3.82 ± 0.10	3.65 ± 0.03	2.94 ± 0.03	2.84 ± 0.05	2.67 ± 0.16	4.13 ± 0.19	3.00–4.71
τ₁ (Gyr)	0.30 ± 0.02	0.16 ± 0.01	0.29 ± 0.01	0.29 ± 0.02	0.30 ± 0.02	0.20 ± 0.02	0.32 ± 0.02	0.10–0.47
τ₂ (Gyr)	2.23 ± 0.13	2.40 ± 0.12	3.00 ± 0.15	4.00 ± 0.28	5.99 ± 1.19	9.40 ± 2.35	2.86 ± 0.70	3.63–11.49
σ₂/σ₁	1.99 ± 0.06	4.34 ± 0.11	8.80 ± 0.26	9.86 ± 0.32	11.49 ± 0.44	14.29 ± 0.60	7.61 ± 0.23	3.69–10.54
σ_tot (M_⊙ pc⁻²)	46.9 ± 8.8	39.8 ± 7.4	29.9 ± 5.6	21.1 ± 3.9	14.3 ± 2.7	9.4 ± 1.8	161.5 ± 30.2	−
τ_up (Gyr)	1.00 ± 0.20	0.58 ± 0.07	0.32 ± 0.03	0.33 ± 0.03	0.40 ± 0.04	0.37 ± 0.07	0.55 ± 0.06	−

Notes. The σ_tot total surface mass density is fitted in the global sample. The σ_tot,n partial surface mass densities are calculated by a weighted distribution within the six regions in a way described in the text. The number of stars contained by each zone is denoted by N_⋆.

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