The evolution of cluster magnetic fields probed by the SKA

Details The evolution of cluster magnetic fields probed by the SKA The evolution of cluster magnetic fields probed by the SKA

Aug 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009rmxac..36..231h&link_type=abstract

Magnetic Fields in the Universe II: From Laboratory and Stars to the Primordial Universe - Supplementary CD (Eds. A. Esquivel, J

Astronomy and Astrophysics

Astronomy

Galaxies: Clusters, Galaxies: Jets, Intergalactic Medium, Magnetic Fields, Mhd

Scientific paper

The Square Kilometer Array (SKA) will provide an unparalleled tool to study magnetic fields, and indeed one of the ``Key Science Cases'' for the SKA is the origin and evolution of cosmic magnetism. As part of the European SKA Design Study (SKADS) we are developing sky simulations and associated instrumental simulations of various experiments to probe the evolution of magnetic fields. In particular we are considering in detail how cluster magnetic fields can be probed to high redshift using Faraday rotation against background sources as the probe. In this presentation, modelling and observations of the magnetic fields in galaxy clusters are described in the context of the SKA. We show how it will be possible with the SKA to study evolution of the field in clusters out to high redshift. We also discuss our work on 3D MHD simulations of a magnetised galaxy cluster, when we have AGN feedback from a powerful FRradio source. The initial magnetic structure of this cluster has a spatial spectrum with a range of spectral index and randomly generated phases; the intra-cluster medium plasma is implemented with physical properties resembling those observed in many clusters. We discuss briefly the ability of the SKA to observe any signature of past AGN activity in clusters.

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