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Clusters of galaxies, the largest collapsed structures in the Universe, arelocated at the intersection of extended filaments of baryons and dark matter.Cosmological accretion onto clusters through large scale filaments addsmaterial at cluster outskirts. Kinetic energy in the form of bulk motions andturbulence due to this accretion provides a form of pressure support againstgravity, supplemental to thermal pressure. Significant amount of non-thermalpressure support could bias cluster masses derived assuming hydrostaticequilibrium, the primary proxy for cluster cosmology studies. Sensitivemeasurements of Doppler broadening and shift of astrophysical lines, and therelative fluctuations in thermodynamical quantities (e.g., density, pressure,and entropy) are primary diagnostic tools. Forthcoming planned and proposedX-ray (with large etendue, throughput, and high spectral resolution) and SZobservatories will provide crucial information on the assembly andvirialisation processes of clusters, involving turbulent eddies cascading atvarious spatial scales and larger gas bulk motions in their external regions tothe depth or their potential wells.

Probing Macro-Scale Gas Motions and Turbulence in Diffuse Cosmic Plasmas