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SUMMARY:Cosmological magnetic field: what do we learn from AMR simulations
  ? - Yohan Dubois (Oxford University)
DTSTART:20091026T160000Z
DTEND:20091026T170000Z
UID:TALK19914@talks.cam.ac.uk
CONTACT:Laurène Jouve
DESCRIPTION:Using adaptive mesh refinement simulations I will describe the
 \nevolution of the magnetic field in the hot plasma of a galaxy cluster.\n
 I will point out that this field is more amplified in the cluster core\nif
  the cluster experienced a cooling flow than in a pure adiabatic\ncase. Bu
 t this scenario becomes even more complex when an active\ngalactic nuclei 
 releases energy into the intra-cluster medium and\nleads to the destructio
 n of the cool core of the cluster. The initial\nseed field\, which is a fr
 ee parameter in these models\, is chosen to\nproduce results in agreement 
 with observations. But the origin of the\ncosmological magnetic field is s
 till uncertain. Expanding galactic\nwinds due to supernovae feedback can p
 rovide a coherent scenario of\nthe magnetic enrichment of the inter-galact
 ic medium\, and then draw a\nnew scenario on the origin of the magnetic fi
 eld at very large scales.
LOCATION:MR14\, DAMTP\, Pav. F
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