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Table 4.
Upper limits for the FRB repetition rate (last column) coming from confirmed ULXs.
| ULX | Nu | λu (yr−1) |
|---|---|---|
| IC 342 X-1, IC 342 X-2 | 2 | < 128 |
| M 82 X-2 | 1 | < 140 |
| M 101 X-1 | 1 | < 273 |
| NGC 6946 X-1 | 1 | < 227 |
| All | 14 | < 13 |
Notes. In the second column we report the number of ULXs present in a given galaxy. The last row considers the total expected ULX ensamble derived from Eq. (12).
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