Features of collisionless turbulence in the intracluster medium from simulated Faraday Rotation maps

Observations of the intracluster medium (ICM) in galaxy clusters suggest for the presence of turbulence and the magnetic fields' existence has been proved through observations of Faraday Rotation (FR) and synchrotron emission. The ICM is also known to be filled by a rarefied weakly collisional...

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Autor principal: Nakwacki, Maria Soledad
Publicado: 2016
Materias:
Galaxies: clusters: intracluster medium
Magnetic fields
Methods: numerical
Turbulence
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00358711_v455_n4_p3702_Nakwacki
http://hdl.handle.net/20.500.12110/paper_00358711_v455_n4_p3702_Nakwacki
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_00358711_v455_n4_p3702_Nakwacki
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spelling paper:paper_00358711_v455_n4_p3702_Nakwacki2023-06-08T15:01:41Z Features of collisionless turbulence in the intracluster medium from simulated Faraday Rotation maps Nakwacki, Maria Soledad Galaxies: clusters: intracluster medium Magnetic fields Methods: numerical Turbulence Observations of the intracluster medium (ICM) in galaxy clusters suggest for the presence of turbulence and the magnetic fields' existence has been proved through observations of Faraday Rotation (FR) and synchrotron emission. The ICM is also known to be filled by a rarefied weakly collisional plasma. In this work, we study the possible signatures left on FR maps by collisionless instabilities. For this purpose, we use a numerical approach to investigate the dynamics of the turbulence in collisionless plasmas based on an magnetohydrodynamical (MHD) formalism taking into account different levels of pressure anisotropy. We consider models covering the sub/super-Alfvénic and trans/supersonic regimes, one of them representing the fiducial conditions corresponding to the ICM. From the simulated models, we compute FR maps and analyse several statistical indicators in order to characterize the magnetic field structure and compare the results obtained with the collisionless model to those obtained using standard collisional MHD framework. We find that important imprints of the pressure anisotropy prevails in the magnetic field and also manifest in the associated FR maps which evidence smaller correlation lengths in the collisionless MHD case. These points are remarkably noticeable for the case mimicking the conditions prevailing in ICM. Nevertheless, in this study we have neglected the decrease of pressure anisotropy due to the feedback of the instabilities that naturally arise in collisionless plasmas at small scales. This decrease may not affect the statistical imprint differences described above, but should be examined elsewhere. © 2015 The Authors. Fil:Nakwacki, M.S. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2016 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00358711_v455_n4_p3702_Nakwacki http://hdl.handle.net/20.500.12110/paper_00358711_v455_n4_p3702_Nakwacki
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Galaxies: clusters: intracluster medium
Magnetic fields
Methods: numerical
Turbulence
spellingShingle Galaxies: clusters: intracluster medium
Magnetic fields
Methods: numerical
Turbulence
Nakwacki, Maria Soledad
Features of collisionless turbulence in the intracluster medium from simulated Faraday Rotation maps
topic_facet Galaxies: clusters: intracluster medium
Magnetic fields
Methods: numerical
Turbulence
description Observations of the intracluster medium (ICM) in galaxy clusters suggest for the presence of turbulence and the magnetic fields' existence has been proved through observations of Faraday Rotation (FR) and synchrotron emission. The ICM is also known to be filled by a rarefied weakly collisional plasma. In this work, we study the possible signatures left on FR maps by collisionless instabilities. For this purpose, we use a numerical approach to investigate the dynamics of the turbulence in collisionless plasmas based on an magnetohydrodynamical (MHD) formalism taking into account different levels of pressure anisotropy. We consider models covering the sub/super-Alfvénic and trans/supersonic regimes, one of them representing the fiducial conditions corresponding to the ICM. From the simulated models, we compute FR maps and analyse several statistical indicators in order to characterize the magnetic field structure and compare the results obtained with the collisionless model to those obtained using standard collisional MHD framework. We find that important imprints of the pressure anisotropy prevails in the magnetic field and also manifest in the associated FR maps which evidence smaller correlation lengths in the collisionless MHD case. These points are remarkably noticeable for the case mimicking the conditions prevailing in ICM. Nevertheless, in this study we have neglected the decrease of pressure anisotropy due to the feedback of the instabilities that naturally arise in collisionless plasmas at small scales. This decrease may not affect the statistical imprint differences described above, but should be examined elsewhere. © 2015 The Authors.
author Nakwacki, Maria Soledad
author_facet Nakwacki, Maria Soledad
author_sort Nakwacki, Maria Soledad
title Features of collisionless turbulence in the intracluster medium from simulated Faraday Rotation maps
title_short Features of collisionless turbulence in the intracluster medium from simulated Faraday Rotation maps
title_full Features of collisionless turbulence in the intracluster medium from simulated Faraday Rotation maps
title_fullStr Features of collisionless turbulence in the intracluster medium from simulated Faraday Rotation maps
title_full_unstemmed Features of collisionless turbulence in the intracluster medium from simulated Faraday Rotation maps
title_sort features of collisionless turbulence in the intracluster medium from simulated faraday rotation maps
publishDate 2016
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00358711_v455_n4_p3702_Nakwacki
http://hdl.handle.net/20.500.12110/paper_00358711_v455_n4_p3702_Nakwacki
work_keys_str_mv AT nakwackimariasoledad featuresofcollisionlessturbulenceintheintraclustermediumfromsimulatedfaradayrotationmaps
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