Mathematics – Logic
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21714905x&link_type=abstract
American Astronomical Society, AAS Meeting #217, #149.05; Bulletin of the American Astronomical Society, Vol. 43, 2011
Mathematics
Logic
Scientific paper
Radio observations suggested micro Gauss magnetic fields permeating the Intra Cluster Medium (ICM) in the galaxy clusters. Theory and simulations suggest that magnetic fields from Active Galactic Nucleus (AGNs) powered by their central super massive black holes can be an important source of these magnetic fields in the ICM. We present cosmological Adaptive Mesh Refinement (AMR) magnetohydrodynamic (MHD) simulations following the cluster formation and evolution of magnetic fields originally injected by AGN. We have performed simulations of a suite of galaxy clusters with virial masses ranging from 1 × 1014 to 2 × 1015 M&sun;. In most clusters, the injected magnetic fields can be transported throughout the whole cluster and be further amplified by the ICM turbulence to micro Gauss level. The magnetic field strength and total energy are dependent on the sizes of the clusters, while the amplification processes of the magnetic fields are determined by the cluster merger history. We will demonstrate how the ICM MHD turbulence is excited and sustained by the frequent mergers during the cluster formation. We will discuss the small-scale dynamo processes and their relations to the ICM turbulence in different clusters. We will also present the distributions of magnetic fields and Synthetic Faraday rotation measurement (FRM) of our simulated clusters.
This work was supported by the DOE/OFES via the Center for Magnetic Self-Organization and the LDRD program at LANL.
Li Handong
Xu Hao
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