4XMM DR11s (xmm4_dr11s)


The stacked catalogue 4XMM-DR11s has been compiled from 1,475 groups of exposures, comprising at total of 8,292 selected overlapping XMM-Newton observations and covering about 350 square degrees of multiply observed sky patches. It contains 358,809 unique sources, 275,440 of them multiply observed, with positions and source parameters like fluxes in the XMM-Newton standard energy bands, hardness ratios, quality estimate, and information on inter-observation variability. The parameters are directly derived from the simultaneous fit, and, wherever applicable, additionally calculated for each contributing observation. The catalog aims at exploring the multiply observed sky regions and exploit their survey potential, in particular to study the long-term behavior of X-ray emitting sources. It thus makes use of the long(er) effective exposure time per sky area and offers the opportunity to investigate flux variability directly through the source detection process.


Users of the catalogue are kindly asked to reference the catalogue papers Traulsen et al. 2020, A&A 641, A137 and 2019, A&A 624, A77, and to include the policy statement:

This research has made use of data obtained from the 4XMM XMM-Newton serendipitous stacked source catalogue 4XMM-DR10s compiled by the institutes of the XMM-Newton Survey Science Centre selected by ESA.