Mathematics – Logic
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21933809x&link_type=abstract
American Astronomical Society, AAS Meeting #219, #338.09
Mathematics
Logic
Scientific paper
We perform adaptive mesh refinement (AMR) cosmological magneto-hydrodynamic (MHD) simulations to investigate the evolution and distribution of magnetic fields in the intra-cluster medium (ICM ) of galaxy clusters. We show that the cluster magnetic fields can be amplified and maintained by the ICM turbulence to the observed level at micro Gauss. The ICM MHD turbulence is excited and sustained by the frequent mergers during the cluster formation. This turbulence operates the small-scale dynamo process that transports and amplifies the fields. This process could be the primary process of populating the whole cluster with magnetic fields. The distribution of the magnetic fields are determined by the ICM turbulence and are not sensitive to the initial magnetic fields. We will show synthetic radio observations, e.g. Faraday rotation measurement and radio halos/relics, from our simulated clusters and then compare them with observations from VLA. The results show that the magnetic fields from our simulations are consistent with observations.
This work is supported by the LDRD and IGPP programs at LANL and by DOE/Office of Fusion Energy Science.
Li Handong
Xu Hao
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