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Cosmological probes based on galaxy clusters rely on cluster number countsand large-scale structure information. X-ray cluster surveys are well suitedfor this purpose, since they are far less affected than optical surveys byprojection effects, and cluster properties can be predicted with good accuracy.The XMM Cluster Archive Super Survey, X-CLASS, is a serendipitous search ofX-ray-detected galaxy clusters in 4176 XMM-Newton archival observations untilAugust 2015. All observations are clipped to exposure times of 10 and 20 ks toobtain uniformity and they span ~269 deg$^2$ across the high-Galactic latitudesky ($|b|> 20^o$). The main goal of the survey is the compilation of awell-selected cluster sample suitable for cosmological analyses. We describethe detection algorithm, the visual inspection, the verification process andthe redshift validation of the cluster sample, as well as the cluster selectionfunction computed by simulations. We also present the various metadata that arereleased with the catalogue, along with the redshifts of 124 clusters obtainedwith a dedicated multi-object spectroscopic follow-up programme. With thispublication we release the new X-CLASS catalogue of 1646 well-selectedX-ray-detected clusters over a wide sky area, along with their selectionfunction. The sample spans a wide redshift range, from the local Universe up toz~1.5, with 982 spectroscopically confirmed clusters, and over 70 clustersabove z=0.8. Because of its homogeneous selection and thorough verification,the cluster sample can be used for cosmological analyses, but also as atest-bed for the upcoming eROSITA observations and other current and futurelarge-area cluster surveys. It is the first time that such a catalogue is madeavailable to the community via an interactive database which gives access to awealth of supplementary information, images, and data.

The X-CLASS survey: A catalogue of 1646 X-ray-selected galaxy clusters up to z$\sim$1.5