Table 4.
Estimates of the recombination time, absorber size, and light-crossing time of UFOs in AGNs.
| Names | Recombination | Absorber size | Light-crossing |
|---|---|---|---|
| time (s) | (cm) | time (s) | |
| PG 1448 | < 10 | < 2 × 1013 | < 700 |
| IRAS 13224 | < 1 | < 1.4 × 1012 | < 50 |
| PG 1211 | < 100 | < 5 × 1013 | < 1700 |
Notes. The absorber size was calculated by assuming that the transverse velocity is equal to the Keplerian velocity. The light-crossing time of absorbers was conservatively estimated by assuming a transparent absorber for hard X-ray photons. The recombination timescale was estimated by assuming the number density of 1010 cm−3 for PG 1448 (Reeves et al. 2023), 1011 cm−3 for IRAS 13224 (Pinto et al. 2018), and 108 cm−3 for PG 1211 (Reeves et al. 2018).
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