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

14 Mar 2019  ·  Bulbul Esra, Gaspari Massimo, Alvarez Gabriella, Avestruz Camille, Bautz Mark, Benson Brad, Biffi Veronica, Burke Douglas, Clerc Nicolas, Chadayammuri Urmila, Churazov Eugene, Cucchetti Edoardo, Eckert Dominique, Ettori Stefano, Forman Bill, Gastaldello Fabio, Ghirardini Vittorio, Kraft Ralph, Markevitch Maxim, McDonald Mike, Miller Eric, Mroczkowski Tony, Nagai Daisuke, Nulsen Paul, Pratt Gabriel W., Randall Scott, Reiprich Thomas, Roncarelli Mauro, Simionescu Aurora, Smith Randall, Tremblay Grant, Walker Stephen, Zhuravleva Irina, ZuHone John ·

Clusters of galaxies, the largest collapsed structures in the Universe, are located at the intersection of extended filaments of baryons and dark matter. Cosmological accretion onto clusters through large scale filaments adds material at cluster outskirts... Kinetic energy in the form of bulk motions and turbulence due to this accretion provides a form of pressure support against gravity, supplemental to thermal pressure. Significant amount of non-thermal pressure support could bias cluster masses derived assuming hydrostatic equilibrium, the primary proxy for cluster cosmology studies. Sensitive measurements of Doppler broadening and shift of astrophysical lines, and the relative fluctuations in thermodynamical quantities (e.g., density, pressure, and entropy) are primary diagnostic tools. Forthcoming planned and proposed X-ray (with large etendue, throughput, and high spectral resolution) and SZ observatories will provide crucial information on the assembly and virialisation processes of clusters, involving turbulent eddies cascading at various spatial scales and larger gas bulk motions in their external regions to the depth or their potential wells. read more

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Cosmology and Nongalactic Astrophysics