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The current cosmological model includes cold dark matter, which consists ofmassive nonrelativistic particles. There are also some observational andtheoretical evidences for warm dark matter. The existence of warm DM can beexamined by measuring of the galaxy clusters density profiles and accuratecounting of dwarf galaxies. In this work I suppose that DM haloes are welltraced by X-ray gas in clusters, groups, pairs and even single galaxies. Thetype of DM is inspected with the Xgal sample of 5021 X-ray emitting galaxiesobserved by XMM-Newton. The selection bias of this sample is also analyzed.

Determination of dark matter type by X-ray sources statistics