Table 1.
Stellar populations properties of UDGs and LSBs in Hydra I.
| Object | Position in Hydra | Age | [M/H] | M* | [Mg/Fe] | [α/Fe] | t90 | t50 |
|---|---|---|---|---|---|---|---|---|
| [Gyr] | [dex] | [108 M⊙] | [dex] | [dex] | [Gyr] | [Gyr] | ||
| (1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) |
| UDG 1 | Very early infall | 7.6 ± 2.9 | −0.5 ± 0.1 | 1.73 ± 0.43 | −0.8 ± 0.2 | −0.4 ± 0.1 | 1.0 ± 2.8 | 13.6 ± 7.5 |
| UDG 4 | Late infall | 13.7 ± 0.2 | −0.9 ± 0.1 | 9.07 ± 0.28 | 0.3 ± 0.2 | 0.2 ± 0.1 | 13.3 ± 0.1 | 13.7 ± 0.1 |
| UDG 8 | Late infall | 8.4 ± 0.7 | −1.2 ± 0.1 | 0.71 ± 0.04 | 0.1 ± 0.2 | 0.1 ± 0.1 | 8.6 ± 0.6 | 9.2 ± 0.7 |
| UDG 9 | Very early infall | 12.7 ± 0.6 | −0.7 ± 0.1 | 2.62 ± 0.22 | 1.1 ± 0.4 | 0.6 ± 0.2 | 13.1 ± 0.2 | 13.3 ± 0.5 |
| UDG 11 | Very early infall | 7.3 ± 0.3 | −1.3 ± 0.1 | 1.41 ± 0.05 | 0.4 ± 0.2 | 0.2 ± 0.1 | 6.9 ± 0.4 | 7.8 ± 0.4 |
| UDG 12 | Very early infall | 9.0 ± 0.5 | −0.9 ± 0.1 | 1.25 ± 0.07 | 0.3 ± 0.2 | 0.2 ± 0.1 | 7.6 ± 1.4 | 8.0 ± 1.0 |
| LSB 5 | Very early infall | 8.6 ± 1.4 | −0.7 ± 0.2 | 0.85 ± 0.12 | −1.1 ± 0.8 | −0.6 ± 0.4 | 0.8 ± 0.2 | 13.6 ± 0.6 |
| LSB 6 | Late infall | 8.9 ± 0.7 | −1.0 ± 0.1 | 3.55 ± 0.24 | −0.1 ± 0.2 | 0.0 ± 0.1 | 7.7 ± 1.6 | 9.0 ± 0.7 |
| LSB 7 | Very early infall | 9.2 ± 1.0 | −0.7 ± 0.1 | 4.39 ± 0.41 | −0.1 ± 0.3 | 0.0 ± 0.2 | 9.3 ± 0.7 | 11.1 ± 1.1 |
| LSB 8 | Late infall | 11.1 ± 1.0 | −0.8 ± 0.1 | 3.31 ± 0.24 | −0.7 ± 0.3 | −0.4 ± 0.2 | 9.5 ± 0.9 | 11.1 ± 1.4 |
Notes. Column 1 reports the target name in the LEWIS sample. Column 2 reports the position of the LEWIS sample in Hydra I, according to the infall diagnostic diagram. Columns 3–6 report the age, metallicity, stellar masses, and α-enhanced derived from stellar population analysis. Column 7 reports the derived [α/Fe] computed using the formula [α/Fe] = 0.02 + 0.56 × [Mg/Fe]. Columns 8 and 9 report the 90th and 50th percentiles of SF times, respectively.
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