Table 1.
LEWIS sample: UDG and LSB galaxies in the Hydra I cluster.
| Object | μ0 | Reff | ϵ | Type | Location in Hydra I |
|---|---|---|---|---|---|
| [mag arcsec−2] | [kpc] | ||||
| (1) | (2) | (3) | (4) | (5) | (6) |
| UDG1 | 24.2 ± 0.1 | 1.75 ± 0.12 | 0.28 | UDG | Very early infall |
| UDG3 | 25.2 ± 0.2 | 1.88 ± 0.12 | 0.21 | UDG | Very early infall |
| UDG4 | 24.9 ± 0.1 | 2.64 ± 0.12 | 0.30 | UDG | Late infall/Mixed times |
| UDG6 | 24.1 ± 0.1 | 1.37 ± 0.12 | 0.59 | UDG/cLSB | Very early infall |
| UDG7 | 24.4 ± 0.4 | 1.66 ± 0.12 | 0.14 | UDG | Very early infall |
| UDG8 | 23.2 ± 0.6 | 1.40 ± 0.12 | 0.53 | Dwarf/Extended dwarf | Late infall/Mixed times |
| UDG9 | 24.2 ± 0.2 | 3.46 ± 0.12 | 0.41 | UDG | Very early infall |
| UDG10 | 24.3 ± 0.3 | 2.29 ± 0.10 | 0.14 | UDG | Very early infall |
| UDG11 | 24.4 ± 0.1 | 1.66 ± 0.12 | 0.30 | UDG | Very early infall |
| UDG12 | 25.1 ± 0.2 | 1.64 ± 0.12 | 0.29 | UDG | Very early infall |
| UDG13 | 24.2 ± 0.2 | 1.60 ± 0.20 | 0.15 | UDG/cLSB | Very early infall |
| UDG15 | 25.0 ± 0.3 | 1.51 ± 0.15 | 0.27 | UDG/cLSB | Very early infall |
| UDG16 | 25.9 ± 0.2 | 1.75 ± 0.12 | – | UDG | – |
| UDG17 | 24.9 ± 0.1 | 1.50 ± 0.20 | – | UDG/cLSB | – |
| UDG20 | 26.0 ± 0.3 | 1.97 ± 0.12 | 0.45 | UDG | Late infall/Mixed times |
| UDG21 | 24.0 ± 0.4 | 1.50 ± 0.12 | 0.20 | Transition | Very early infall |
| UDG22 | 25.3 ± 0.2 | 3.60 ± 0.12 | – | UDG | Late infall/Mixed times |
| UDG23 | 24.3 ± 0.3 | 2.47 ± 0.20 | 0.16 | UDG | Very early infall |
| UDG32 | 26.2 ± 1.0 | 3.80 ± 1.00 | – | UDG | Very early infall |
| LSB1 | 23.9 ± 0.2 | 0.81 ± 0.90 | 0.12 | Transition | Very early infall |
| LSB4 | 24.7 ± 0.1 | 1.48 ± 0.12 | 0.35 | UDG/cLSB | Very early infall |
| LSB5 | 23.9 ± 0.1 | 1.42 ± 0.12 | 0.49 | Dwarf/Extended dwarf | Very early infall |
| LSB6 | 23.0 ± 0.2 | 4.00 ± 1.00 | 0.48 | Extended dwarf | Late infall/Mixed times |
| LSB7 | 22.7 ± 0.1 | 1.97 ± 0.10 | 0.26 | Extended dwarf | Very early infall |
| LSB8 | 23.2 ± 0.2 | 1.51 ± 0.20 | 0.17 | Dwarf/Extended dwarf | Late infall/Mixed times |
Notes. Column 1 reports the target name of the galaxy in the LEWIS sample. Columns 2 and 3 report the central surface brightness μ0 and effective radius Reff in the g band from Iodice et al. (2020a) and La Marca et al. (2022a), respectively. Column 4 reports the average ellipticity of the galaxy measured from the isophotal analysis performed on the MUSE reconstructed image. Column 5 reports the morphological classification of the galaxy according to the structural parameters and their uncertainties. Column 6 reports the location of the galaxy within the Hydra I cluster, according to the infall diagnostic diagram (Forbes et al. 2023). Missing values correspond to the galaxies with on-going observations (UDG16, UDG17, and UDG22). UDG32 is a special case and will be presented in detail in a dedicated paper (Hartke et al. 2025).
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