Probing Macro-Scale Gas Motions and Turbulence in Diffuse Cosmic Plasmas
arXiv:1903.04597
Abstract
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.
arXiv comment5 pages, 3 figures, Science white paper submitted to the Astro2020 Decadal Survey
References in corpus (30)
- The Quiescent Intracluster Medium in the Core of the Perseus Cluster
- Probing Turbulence in the Coma Galaxy Cluster
- On the nature of hydrostatic equilibrium in galaxy clusters
- X-Ray surface brightness and gas density fluctuations in the Coma cluster
- Atmospheric gas dynamics in the Perseus cluster observed with Hitomi
- The Physics of Galaxy Cluster Outskirts
- The relation between gas density and velocity power spectra in galaxy clusters: high-resolution hydrodynamic simulations and the role of conduction
- AGN jet feedback on a moving mesh: cocoon inflation, gas flows and turbulence
- Witnessing the Growth of the Nearest Galaxy Cluster: Thermodynamics of the Virgo Cluster Outskirts
- Mass Accretion and its Effects on the Self-Similarity of Gas Profiles in the Outskirts of Galaxy Clusters
- Azimuthally Resolved X-Ray Spectroscopy to the Edge of the Perseus Cluster
- Gas Density Fluctuations in the Perseus Cluster: Clumping Factor and Velocity Power Spectrum
- Thermal SZ fluctuations in the ICM: probing turbulence and thermodynamics in Coma cluster with
- Properties of gas clumps and gas clumping factor in the intra cluster medium
- Chemical Enrichment RGS cluster sample (CHEERS): Constraints on turbulence
- The stripping of a galaxy group diving into the massive cluster A2142
- The growth of the galaxy cluster Abell 85: mergers, shocks, stripping and seeding of clumping
- Velocity width measurements of the coolest X-ray emitting material in the cores of clusters, groups and elliptical galaxies
- The turbulent pressure support in galaxy clusters revisited
- Physical Origins of Gas Motions in Galaxy Cluster Cores: Interpreting Hitomi Observations of the Perseus Cluster
- Measuring turbulence and gas motions in galaxy clusters via synthetic Athena X-IFU observations
- Imaging the Thermal and Kinematic Sunyaev-Zel'dovich Effect Signals in a Sample of Ten Massive Galaxy Clusters: Constraints on Internal Velocity Structures and Bulk Velocities
- The Role of Penetrating Gas Streams in Setting the Dynamical State of Galaxy Clusters
- A textbook example of ram-pressure stripping in the Hydra A/A780 cluster
- What Do the Hitomi Observations Tell Us About the Turbulent Velocities in the Perseus Cluster? Probing the Velocity Field with Mock Observations
- Measuring the gas clumping in Abell 133
- Multi-scale analysis of turbulence evolution in the density stratified intracluster medium
- The Hot and Energetic Universe: The astrophysics of galaxy groups and clusters
- Limits on turbulent propagation of energy in cool-core clusters of galaxies
- The IllustrisTNG Simulations: Public Data Release