Table 1
Gaseous and stellar properties of six isolated UDGs.
| (1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) | |
| Name | Type | D | r eff | S HI | M HI | V sys | W 50 | M ∗ | M HI / M ∗ | Reference |
| (Mpc) | (kpc) | (Jykm s-1) | (M⊙) | (km s-1) | (km s-1) | (M⊙) | ||||
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| This work | ||||||||||
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| DGSAT I | q | 78 | 4.5 | < 0.17 (5σ) | < 2.4 × 108 (5σ) | 5450 ± 40a | ... | 4 × 108 | < 0.61 (5σ) | M16 |
| M-161-1 | q | 81 | 4.1 | < 0.083 (5σ) | < 1.3 × 108 (5σ) | 5600 ± 200 a | ... | 2.5 × 108 b | < 0.52 (5σ) | D97 |
| R-127-1 | q | 75 | 4.2 | < 0.10 (5σ) | < 1.3 × 108 (5σ) | 5250 ± 200a | ... | 3.2 × 108 b | < 0.41 (5σ) | D97 |
| SdI-2 | sf | 40 | 1.3 | 0.63 | 2.4 × 108 | 2543 | 69 | 0.9 × 107 | 27 | B17 |
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| From literature | ||||||||||
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| SdI-1 | sf | 112 | 2.6 | 1.2 × 109 | 7791 | 90 | 1 × 107 | 120 | B17, R04 | |
| UGC 2162 | sf | 12.3 | 1.7 | 1.9 × 108 | 1172 | 55 | 2 × 107 | 10 | T17, M04 | |
Notes. (1) Quiescent (q) or star-forming (sf) galaxy according to optical spectrum. (2) Distance. (3) Radius enclosing half of the total light. (4) Total flux of the HI emission line. Reported only for objects observed in this work. (5) Total HI mass. (6) Heliocentric recessional velocity, measured from the central velocity of the HI line profile. (7) Observed velocity width of the HI line profile, at 50% of the peak intensity level (uncorrected for inclination). (8) Stellar mass. (9) HI gas fraction. (10) References: Martínez-Delgado et al. (2016, M16), Dalcanton et al. (1997, D97), Bellazzini et al. (2017, B17), Trujillo et al. (2017, T17), Roberts et al. (2004, R04), Meyer et al. (2004, M04).
Stellar masses are calculated from the V-band magnitude (D97), and assuming V−I = 1.0 (same color as DGSAT I). We use the mass-to-light calibration of Into & Portinari (2013, Table 3).
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