I will present a recent interpretation of XRISM X-ray measurements ofturbulence in the intracluster medium (ICM), comparing idealised models of turbulence and the resultsof cosmological simulations of evolving clusters of galaxies. These results highlight the combined biases driven by the inhomogeneity of turbulence in the ICM and by the X-ray weighting in observations, and appear to release the claimed tension between the XRISM data and current numerical simulations. A turbulent spectrum much steeper than Kolmogorov is not required bycurrent observational data, and the (still simplistic) dynamical picture of the ICM arising from cosmological simulations appears capable of full reproducing present XRISM observations.
Dynamical vs idealised turbulence in the ICM: a view from simulations.