Table 4
Fractions of UDGs in the Fornax and Coma clusters.
| Fornax (r = 450 kpc) | Fornax (r = 0.7 Mpc) | Coma (r = 700 kpc) | Coma (r = 2.5 Mpc) | |
|
|
||||
| UDGs | 9±3 | 42±12 | 98 | 288 |
| 1.5 kpc < Re < 3 kpc | 5 | 22±8 | 91 | 267 |
| Re > 3 kpc | 4 | 19±7 | 7 | 21 |
| UDGs/Mpc-2 | 25±8 | – | 64 | – |
Normalized frequency,  |
0.7±0.2 | – | 0.45±0.05 | – |
Notes. The first column gives the UDG identifications in this study (within two core radii from the center ~450 kpc), the second column gives the upper limits when those numbers are extrapolated to the virial radius of 0.7 Mpc (Drinkwater et al. 2001a), being corrected also for the expected number of UDGs that are missed as parts of the area is excluded due to bright sources. The third column gives the number of UDGs in the Coma cluster within two core radii (~700 kpc) from the center. The fourth column gives the number of UDGs in the whole sample of Yagi et al. (2016), which reaches up to 2.5 Mpc from the center of the Coma cluster. The Poisson uncertainties are based on the actual number of objects.
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