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Limits on the ions temperature anisotropy in turbulent intracluster medium
Santo-Lima, R. ; Yan, Huirong ; Pino, E. M. De Gouveia Dal ; Lazarian, A.
Deutsches Elektronen-Synchrotron, DESY, Hamburg 2016
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Título:
Limits on the ions temperature anisotropy in turbulent intracluster medium
Autor:
Santo-Lima, R.
;
Yan, Huirong
;
Pino, E. M. De Gouveia Dal
;
Lazarian, A.
Notas:
RelationTypeNote: IsVariantFormOf -- 10.1093/mnras/stw1079
10.1093/mnras/stw1079
0035-8711
1365-2966
arXiv:1601.03837
Published by Oxford Univ. Press, Oxford
Monthly notices of the Royal Astronomical Society 460, 2492 - 2504(2016). doi:10.1093/mnras/stw1079
Descrição:
Turbulence in the weakly collisional intracluster medium of galaxies (ICM) is able to generate strong thermal velocity anisotropies in the ions (with respect to the local magnetic field direction), if the magnetic moment of the particles is conserved in the absence of Coulomb collisions. In this scenario, the anisotropic pressure magnetohydrodynamic (AMHD) turbulence shows a very different statistical behaviour from the standard MHD one and is unable to amplify seed magnetic fields, in disagreement with previous cosmological MHD simulations which are successful to explain the observed magnetic fields in the ICM. On the other hand, temperature anisotropies can also drive plasma instabilities which can relax the anisotropy. This work aims to compare the relaxation rate with the growth rate of the anisotropies driven by the turbulence. We employ quasilinear theory to estimate the ions scattering rate due to the parallel firehose, mirror, and ion-cyclotron instabilities, for a set of plasma parameters resulting from AMHD simulations of the turbulent ICM. We show that the ICM turbulence can sustain only anisotropy levels very close to the instabilities thresholds. We argue that the AMHD model which bounds the anisotropies at the marginal stability levels can describe the Alfvenic turbulence cascade in the ICM.
Editor:
Deutsches Elektronen-Synchrotron, DESY, Hamburg
Data de criação/publicação:
2016
Idioma:
Inglês
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