Cosmological Shock Waves in the Large Scale Structure of the Universe

Details Cosmological Shock Waves in the Large Scale Structure of the Universe Cosmological Shock Waves in the Large Scale Structure of the Universe

Apr 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aspc..385..103k&link_type=abstract

Numerical Modeling of Space Plasma Flows: Astronum 2007 ASP Conference Series, Vol. 385, proceedings of the conference held 10-1

Mathematics

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Scientific paper

Collisionless shocks are ubiquitous in astrophysical environments. They govern the nature of cosmic plasma through thermalization of gas and acceleration of nonthermal, cosmic-ray (CR) particles via diffusive shock acceleration (DSA). We study the statistics and energetics of structure formation shocks formed in cosmological hydrodynamic simulations of a concordance ΛCDM universe. Adopting an improved model for gas thermalization and CR acceleration efficiencies based on nonlinear DSA calculations, we estimate the gas thermal energy and the CR energy dissipated at shocks through the history of the universe. Our results reinforce scenarios in which the intracluster medium and warm-hot intergalactic medium contain energetically significant populations of nonthermal particles and turbulent flow motions.

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