Table 4
Comparison of mass, mean stellar age, mean metallicity, and major-to-minor axis ratio of the galaxy components in the HESTIA MW analogue (simulation) with observational values.
| Mstars (1010 M⊙) | ⟨Age⟩ (Gyr) | ⟨[Fe/H]⟩ | c/a | |||||
|---|---|---|---|---|---|---|---|---|
| HESTIA | MW | HESTIA | MW | HESTIA | MW | HESTIA | MW | |
| Bulge | 1.58 | 1.4–1.7 | 8.6 | ~8 | −0.03 | ~ 0.06 | 0.35 | 0.26–0.32 |
| Thin disc | 3.50 | 2.5–4.5 | 6.0 | ~7–8 | 0.02 | ~−0.2 | 0.06 | 0.08–0.17 |
| Thick disc | 0.35 | 0.3–0.9 | 8.5 | ~8–10 | −0.55 | ~−0.6 | 0.38 | 0.33–0.66 |
| Halo | 0.43 | 0.04–0.14 | 9.6 | ~9–13 | −0.74 | ~−1.5 | 0.62 | 0.60–0.90 |
| References | [1, 2] | [3, 4] | [2, 5] | [1] | ||||
Notes. The observational major-to-minor axis ratios for the thin and thick disc are roughly approximated as the ratio between scale height (at the location of the sun) and scale length.
References. [1] Bland-Hawthorn & Gerhard (2016), [2] Deason et al. (2019), [3] Kilic et al. (2017), [4] Sit & Ness (2020), [5] McWilliam (2016).
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