Ricerc@Sapienza

The presence of non-thermal motions in clusters of galaxies plays a relevant role in the determination of their total mass. Indeed, cosmological simulations reveal that cluster masses derived from the assumption of hydrostatic equilibrium can underestimate the real values significantly.
Among the coherent (i.e. non-turbulent) motions of the baryonic cluster components, rotation in particular can be assessed trough a variety of indicators, through observations of the diffuse hot gas and the component galaxies.
We propose in this project the study of the main multi-wavelength observables that can reveal the rotation of baryonic matter within clusters, applied on hydrodynamical cosmological simulations.
We use the high-resolution clusters of the MUSIC dataset to produce the mock data for the study of three observables: (i) the temperature maps of the kinematic component of the Sunyaev-Zel'dovich effect
(ii) X-ray emission spectra from heavy elements in the intracluster gas (iii) spectroscopy-derived velocities of the component galaxies in the optical band.
We will make a feasibility study to address these techniques for the detection of a rotation of real clusters, in order to establish whether it could be observed with the most advanced high-resolution instruments, by applying these analysis techniques to a suitable sample of targets.