Open Access
Table 3
Slope of the metallicity gradient from selected literature papers.
| Reference | Sample | d[Fe/H]/d R𝑔c | N OCs | Comment |
|---|---|---|---|---|
| Friel et al. (2002) | Low-res optical spectra | −0.059±0.010 | 39 | 7<Rցc<16 kpc, all ages |
| Reddy et al. (2016) | High-res optical spectra | −0.052±0.011 | 67 | 6<Rցc<12 kpc and |z| <500 pc |
| −0.015±0.007 | 12 | 12<Rցc>24 kpc | ||
| Carrera et al. (2019) | APOGEE DR14, GALAH DR2 | −0.052±0.003 | 46 | 6<Rցc<13 kpc |
| −0.077±0.007 | 6<Rցc <11kpc | |||
| 0.018±0.009 | 11<Rցc<13 kpc | |||
| Casamiquela et al. (2019) | High-res optical spectra | −0.056±0.0ll | 18 | Rցc<12 kpc, all ages |
| Donor et al. (2020) | APOGEE DR16 | −0.068±0.004 | 68 | Rցc< 13.9 kpc, all ages |
| −0.009±0.0ll | 3 | Rցc> 13.9 kpc, all ages | ||
| Myers et al. (2022) | APOGEE DR17 | −0.055±0.00l | 6<Rցc<11.5 kpc, all ages | |
| Spina et al. (2021) | High-res optical spectras | −0.076±0.009 | 134 | 5<Rցc<12 kpc, all ages |
| Zhang et al. (2021a) | High-res optical spectras | −0.066±0.005 | Rցc<14 kpc, all ages | |
| Cavallo et al. (2024) | Photometric data | −0.048±0.009 | 5<Rցc<12 kpc,ages > 500 Myr |
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