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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/29867
Title: Resolved magnetic dynamo action in the simulated intracluster medium
Authors: VAZZA, FRANCO 
BRUNETTI, GIANFRANCO 
Brüggen, M.
BONAFEDE, ANNALISA 
Issue Date: 2018
Journal: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 
Number: 474
Issue: 2
First Page: 1672
Abstract: Faraday rotation and synchrotron emission from extragalactic radio sources give evidence for the presence of magnetic fields extending over ∼ Mpc scales. However, the origin of these fields remains elusive. With new high-resolution grid simulations, we studied the growth of magnetic fields in a massive galaxy cluster that in several aspects is similar to the Coma cluster. We investigated models in which magnetic fields originate from primordial seed fields with comoving strengths of 0.1 nG at redshift z = 30. The simulations show evidence of significant magnetic field amplification. At the best spatial resolution (3.95 kpc), we are able to resolve the scale where magnetic tension balances the bending of magnetic lines by turbulence. This allows us to observe the final growth stage of the small-scale dynamo. To our knowledge, this is the first time that this is seen in cosmological simulations of the intracluster medium. Our mock observations of Faraday rotation provide a good match to observations of the Coma cluster. However, the distribution of magnetic fields shows strong departures from a simple Maxwellian distribution, suggesting that the three-dimensional structure of magnetic fields in real clusters may be significantly different than what is usually assumed when inferring magnetic field values from rotation measure observations.
URI: http://hdl.handle.net/20.500.12386/29867
URL: http://arxiv.org/abs/1711.02673v1
https://academic.oup.com/mnras/article/474/2/1672/4584474
ISSN: 0035-8711
DOI: 10.1093/mnras/stx2830
Bibcode ADS: 2018MNRAS.474.1672V
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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