Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-09-28
Astronomy and Astrophysics
Astrophysics
invited talk at IAU 208, Astrophysical Supercomputing using Particle Simulations, Tokyo, July 2001
Scientific paper
Cosmological simulations of magnetic fields in galaxy clusters show that remarkable agreement between simulations and observations of Faraday rotation and radio haloes can be achieved assuming that seed fields of 10^{-9} G were present at redshifts 15-20. The structure of the seed field is irrelevant for the final intracluster field. On average, the field grows exponentially with decreasing cluster redshift, but merger events cause steep transient increases in the field strength. Typical field-reversal scales are of order 50 kpc/h. In most cases, the intracluster fields are dynamically unimportant. Assuming secondary electron models, the average structure of cluster radio haloes can naturally be reproduced.
Bartelmann Matthias
Dolag Klaus
Lesch Harald
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