Table 5
Estimation of real and spurious cross-match associations.
| Catalogue | Unshifted | Real | Spurious |
|---|---|---|---|
| SIMBAD | 3489 | ∼1560 (45%) | ∼1928 (55%) |
| Gaia | 14 307 | ∼2433 (17%) | ∼11 873 (83%) |
| OM | 6810 | ∼3503 (51%) | ∼3306 (49%) |
Notes. The estimation of real and spurious cross-match associations is performed exclusively on the subset of sources that do not have a 4XMM-DR14 cross-match (i.e. new sources). It is important to note that a high proportion of spurious cross-match associations does not indicate that the detected sources themselves are spurious.
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