On the coherent rotation of diffuse matter in numerical simulations of galaxy clusters

Abstract

We present a study on the coherent rotation of the intracluster medium and dark matter components of simulated galaxy clusters extracted from a volume-limited sample of the MUSIC project. The set is re-simulated with three different recipes for the gas physics: $(i)$ non-radiative, $(ii)$ radiative without AGN feedback, and $(iii)$ radiative with AGN feedback. Our analysis is based on the 146 most massive clusters identified as relaxed, 57 per cent of the total sample. We classify these objects as rotating and non-rotating according to the gas spin parameter, a quantity that can be related to cluster observations. We find that 4 per cent of the relaxed sample is rotating according to our criterion. By looking at the radial profiles of their specific angular momentum vector, we find that the solid body model is not a suitable description of rotational motions. The radial profiles of the velocity of the dark matter show a prevalence of the random velocity dispersion. Instead, the intracluster medium profiles are characterized by a comparable contribution from the tangential velocity and the dispersion. In general, the dark matter component dominates the dynamics of the clusters, as suggested by the correlation between its angular momentum and the gas one, and by the lack of relevant differences among the three sets of simulations.

12 pages, updated to match the MNRAS version

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• Galaxy clusters in simulations of the local Universe: a matter of constraints
• Constraining the Rotational Kinematic Sunyaev-Zel'dovich Effect in Massive Galaxy Clusters
• A Redshift Survey of the Nearby Galaxy Cluster Abell 2199: Comparison of the Spatial and Kinematic Distributions of Galaxies with the Intracluster Medium
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• The velocity structure of the intracluster medium during a major merger: simulated microcalorimeter observations
• Testing the rotation versus merger scenario in the galaxy cluster Abell 2107
• The Rotational Profiles of Cluster Galaxies
• Searching for rotation in X-COP galaxy clusters
• Messier 90 galactic halo rotation in the microwaves