The 4XMM-DR14 catalogue contains source detections drawn from 13864 XMM-Newton EPIC observations,
covering an energy interval from 0.2 keV to 12 keV.
These observations were made between 2000 February 3 and 2023 December 31 and all datasets
were publicly available by 2023 December 31, but not all public observations are included i
n this catalogue.
The median flux in the total photon energy band (0.2 - 12 keV) of the catalogue detections
is ~ 2.2 × 10-14 erg cm-2 s-1; in the soft energy band (0.2 - 2 keV) the median flux
is ~ 5.2 × 10-15, and in the hard band (2 - 12 keV) it is ~ 1.2 × 10-14.
About 23% of the sources have total fluxes below 1 × 10-14 erg cm-2 s-1.
About a tenth of the observations have features that may cause spurious detections
(mainly the wings of bright sources and large extended emission), and it is strongly
recommended to use a filter (both per source, based on the summary flag column,
and per observation, based on the observation class column).
