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Acceleration of CR at Large Scale Shocks and Their Cosmological Role for Structure Formation in the Universe · arXivDesk

astro-ph/0005445May 23, 20004 pages, 1 figure. Contributed talk, to appear in Cosmic Evolution and Galaxy Formation: Structure, Interactions, and Feedback, ASP Conference Series, eds. J. Franco, E. Terlevich, O. Lopez-Cruz, I. Aretxaga

Acceleration of CR at Large Scale Shocks and Their Cosmological Role for Structure Formation in the Universe

Francesco Miniati, Dongsu Ryu, T. W. Jones, Hyesung Kang

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Abstract

We investigate the dynamical importance of a newly recognized possible source of significant feedback generated during structure formation; namely cosmic ray (CR) pressure. We present evidence for the existence of numerous shocks in the hot gas of galaxy clusters (GCs). We employ for the first time an explicit numerical treatment of CR acceleration and transport in hydro simulations of structure formation. According to our results, CRs provide an important fraction of the total pressure inside GCs, up to several tenths. This was true even at high redshift (z=2), meaning that such non-thermal component could affect the evolution of structure formation.

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