Table 4.
Six clean sources (lowest summary flag ≤1) in the LTV catalogue with EPIC band-8 luminosities above the threshold adopted by E19 to be considered as ULX candidates, and with maximum-to-minimum flux ratios > 10 (values in the EP_MR8 column).
| Source | EP_MR8 | EP_ET2u8 | EP_ET2d8 | EP_ET10u8 | EP_ET10d8 | in E18 list |
|---|---|---|---|---|---|---|
| 013636.4+155036 | 13.2 | 339.5 | 339.46805 | Y | ||
| 022134.1-053105 | 10.4 | 0.14 | 1078.1 | |||
| 073650.0+653603 | 115.2 | 133.7 | 367.7 | 133.7 | 367.7 | |
| 121847.6+472054 | 34.8 | 156.7 | 1640.0 | 339.3 | 1640.0 | Y |
| 213631.9-543357 | 21.9 | 1239.6 | 1239.6 | |||
| 230457.6+122028 | 11.4 | 1465.7 | Y | |||
| 132953.3+471042 | 29.3 | 1839.6 | 4.1 | 1839.6 | 327.1 | Y |
| 203500.1+600908 | 7.5 | 502.7 | 518.6 | Y | ||
Notes. All measurement quantities refer to EPIC band-8 data. The EP_ET quantities are the shortest timescales (in days), in which factor 2 or factor 10 up (u) or down (d) changes of flux are seen in their LTV data. The last two rows are for two of the five sources from E18 that do not appear in the LTV set. The reasons are discussed in the text. For 022134.1-053105 and 230457.6+122028, the EP_ET10u8 and EP_ET10d8 values are absent because with the more conservative definition of these measures (see Sect. 6.6), which include the errors, the changes are smaller than a factor of 10.
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