2020MNRAS.494.1250F

The relaxed galaxy cluster Zwicky 3146 is analysed via the SuperModel, a tool already tested on many clusters since 2009. In particular, this analysis is focused on the intracluster medium X-ray temperature data measured by XMM-Newton up to r₅₀₀. A previous analysis was based on the temperature profile derived from the Sunyaev-Zeld'ovich effect pressure data. The gas mass fraction f_gas is obtained from the resulting SuperModel temperature profile extrapolated up to the virial radius R, which turns out in agreement with the steep temperature profiles observed by Suzaku, and from the gas density profile observed by XMM-Newton. The comparison between f_gas with the universal value indicates a non-thermal pressure component, p_nth, in the cluster outskirts. The SuperModel analysis shows a ratio α(R) (≃50 per cent) of p_nth to the total pressure greater than the values found by simulations, highlighting the possible presence of accreting substructures and inhomogeneities in the gas density profile. Once that this profile is corrected for clumpiness, the level of p_nth is considerably reduced. However, a significant turbulence (α(R)≃20 per cent) and entropy flattening are still present in the outskirts of the galaxy cluster Zwicky 3146.