Mathematics – Logic
Scientific paper
Aug 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd...1e..34k&link_type=abstract
Cosmic Particle Acceleration, 26th meeting of the IAU, Joint Discussion 1, 16-17 August, 2006, Prague, Czech Republic, JD01, #34
Mathematics
Logic
Scientific paper
Cosmological hydrodynamic simulations of the large scale structure formation imply the ubiquity of shocks in the intergalactic space. The particle acceleration at these cosmological shocks may play an important role, since cosmic rays (CRs) are known to be accelerated efficiently at collisionless shocks via diffusive shock acceleration (DSA). We have studied the spatial distribution, statistics and energetics of the shocks formed in three cosmological simulations: 1) adiabatic simulation, 2) simulation with radiative cooling and heating, and 3) simulation with feedback from star formation. Especially, the amount of cosmic rays accelerated at the shocks is estimated, based on a DSA model. We find that the amount of shock dissipation and the CR acceleration are determined primarily by the gravitational potential of the dominant dark matter component, so other physical details do not affect significantly the global energy contents. We also estimate the ratio of CR energy to gas thermal energy dissipated at cosmological shock waves to be ~1/2 through the history of the universe.
Kang Hyesung
Ryu Dongsu
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