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Table 1
Sources included in the analysis.
| Source | Exp.(ks)/obs. | fpulsed limit, % |
|
|
||
| M82 X-1/X-2 | 143/11 | 2.2 |
| NGC 55 ULX | 130/3 | 4.4 |
| NGC 253 PSX-2 | 69/7 | 9.8 |
| NGC 1313 X-1 | 315/18 | 4.4 |
| NGC 2403 X-1 | 66/4 | 8.8 |
| Holmberg II X-1 | 76/7 | 3.7 |
| Holmberg IX X-1 | 195/13 | 4.6 |
| NGC 3628 X-1 | 40/1 | 17.1 |
| NGC 4395 X-1 | 91/3 | 8.6 |
| NGC 4559 X-1 | 31/1 | 11.7 |
| NGC 4861 ULX | 19/3 | 30.7 |
| NGC 4945 X-2 | 39/2 | 25.7 |
| NGC 5204 X-1 | 82/8 | 8.1 |
| M83 ULX | 31/2 | 30.5 |
| NGC 5408 X-1 | 473/10 | 3.6 |
Notes. Upper limits on the pulsed fraction represent the strongest (among all observations) limits at the 3σ confidence level.
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