The Three Hundred project: Contrasting clusters galaxy density in hydrodynamical and dark matter only simulations

Cluster number count is a major cosmological probe for the next generation of large scale-structure surveys like one expected from Euclid satellite mission. Cosmological constraints will be mainly limited by understanding selection function (SF), which characterize probability detecting cluster given mass and redshift. The SF can estimated injecting realistic simulated clusters into survey re-applying detection procedure. For this purpose we intend to use T he hree H undreds project, 324 sample with full-physics hydrodynamical re-simulations. In paper concentrate on study distribution member galaxies in sample. First, possible resolution effects comparing low high simulations. Finally, accounting latter derive density profiles discuss their evolution