Table 1.
Parameters of the UDG candidates in the Hydra I cluster.
| Object | RA | Dec | Mr | g − r | M/L | M* | μ0 | Re | n | q |
|---|---|---|---|---|---|---|---|---|---|---|
| J2000 | J2000 | [mag] | [mag] | [108 M⊙] | [mag arcsec−2] | [kpc] | ||||
| Hydra I-UDG 1 | 10:37:54.12 | −27:09:37.50 | −15.48 ± 0.07 | 0.40 ± 0.09 | 0.90 | 1.12 | 24.20 ± 0.10 | 1.75 ± 0.12 | 0.621 ± 0.005 | 0.766 ± 0.003 |
| Hydra I-UDG 2 | 10:37:34.89 | −27:10:29.94 | −14.27 ± 0.05 | 0.53 ± 0.2 | 1.35 | 0.55 | 24.97 ± 0.08 | 1.55 ± 0.12 | 0.72 ± 0.01 | 0.877 ± 0.007 |
| Hydra I-UDG 3 | 10:36:58.63 | −27:08:10.21 | −14.7 ± 0.2 | 0.75 ± 0.3 | 2.71 | 1.65 | 25.2 ± 0.2 | 1.88 ± 0.12 | 0.572 ± 0.013 | 0.79 ± 0.01 |
| Hydra I-UDG 4 | 10:37:02.64 | −27:12:15.01 | −16.03 ± 0.04 | 0.95 ± 0.10 | 5.11 | 10.6 | 24.86 ± 0.05 | 2.64 ± 0.12 | 0.597 ± 0.006 | 0.748 ± 0.003 |
| Hydra I-UDG 5 | 10:36:07.68 | −27:19:03.26 | −14.66 ± 0.09 | 0.65 ± 0.14 | 1.98 | 1.16 | 23.7 ± 0.3 | 1.42 ± 0.12 | 0.89 ± 0.01 | 0.582 ± 0.004 |
| Hydra I-UDG 6 | 10:36:35.80 | −27:19:36.12 | −14.38 ± 0.08 | 0.32 ± 0.2 | 0.70 | 0.32 | 24.08 ± 0.13 | 1.37 ± 0.12 | 0.706 ± 0.006 | 0.629 ± 0.002 |
| Hydra I-UDG 7 | 10:36:37.16 | −27:22:54.93 | −13.72 ± 0.13 | 0.6 ± 0.3 | 1.98 | 0.49 | 24.37 ± 0.4 | 1.66 ± 0.12 | 1.32 ± 0.03 | 0.73 ± 0.01 |
| Hydra I-UDG 8 | 10:38:14.59 | −27:24:27.07 | −14.87 ± 0.07 | 0.34 ± 0.13 | 0.74 | 0.53 | 23.22 ± 0.6 | 1.40 ± 0.12 | 0.98 ± 0.02 | 0.578 ± 0.005 |
| Hydra I-UDG 9 | 10:37:22.85 | −27:36:02.80 | −15.16 ± 0.12 | 0.6 ± 0.2 | 1.92 | 1.78 | 24.2 ± 0.2 | 3.46 ± 0.12 | 1.38 ± 0.01 | 0.54 ± 0.01 |
| Hydra I-UDG 10 | 10:35:27.32 | −27:33:03.86 | −13.89 ± 0.08 | 0.4 ± 0.2 | 0.90 | 0.26 | 24.33 ± 0.3 | 2.29 ± 0.10 | 1.53 ± 0.02 | 0.90 ± 0.01 |
| Hydra I-UDG 11 | 10:35:04.16 | −27:26:17.26 | −14.75 ± 0.07 | 0.43 ± 0.11 | 0.99 | 0.63 | 24.36 ± 0.13 | 1.66 ± 0.12 | 0.80 ± 0.01 | 0.92 ± 0.01 |
| Hydra I-UDG 12 | 10:34:59.55 | −27:25:37.95 | −14.3 ± 0.2 | 0.8 ± 0.4 | 2.8 | 1.19 | 25.1 ± 0.2 | 1.64 ± 0.12 | 0.67 ± 0.02 | 0.72 ± 0.01 |
Notes. Column 1 reports the name of the UDG candidate. In Cols. 2 and 3 we list the coordinates of the UDGs. In Cols. 4 and 5 are reported the total r-band magnitude and the average g − r colour. Columns 6 and 7 give the stellar mass-to-light ratio and stellar mass, respectively, derived in the r band. Columns 8–11 list the structural parameters derived from the 2D fit in the g band: the central surface brightness, the effective radius in kpc, the n exponent of the Sérsic law and the axial ratio, respectively. Magnitudes and colours are corrected for Galactic extinction using values from Schlegel et al. (1998).
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