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dc.contributor.author
Nakwacki, Maria Soledad
dc.contributor.author
Kowal, G.
dc.contributor.author
Santos-Lima, R.
dc.contributor.author
De Gouveia Dal Pino, E.M.
dc.contributor.author
Falceta-Gonçalves, D.A.
dc.date.available
2019-05-21T18:05:56Z
dc.date.issued
2015-12
dc.identifier.citation
Nakwacki, Maria Soledad; Kowal, G.; Santos-Lima, R.; De Gouveia Dal Pino, E.M.; Falceta-Gonçalves, D.A.; Features of collisionless turbulence in the intracluster medium from simulated Faraday Rotation maps; Oxford University Press; Monthly Notices of the Royal Astronomical Society; 455; 4; 12-2015; 3702-3723
dc.identifier.issn
0035-8711
dc.identifier.uri
http://hdl.handle.net/11336/76809
dc.description.abstract
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.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Oxford University Press
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Galaxies: Clusters: Intracluster Medium
dc.subject
Magnetic Fields
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Methods: Numerical
dc.subject
Turbulence
dc.subject.classification
Astronomía
dc.subject.classification
Ciencias Físicas
dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
dc.title
Features of collisionless turbulence in the intracluster medium from simulated Faraday Rotation maps
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2019-05-14T21:36:05Z
dc.journal.volume
455
dc.journal.number
4
dc.journal.pagination
3702-3723
dc.journal.pais
Reino Unido
dc.journal.ciudad
Londres
dc.description.fil
Fil: Nakwacki, Maria Soledad. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; Argentina. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina
dc.description.fil
Fil: Kowal, G.. Universidade do Sao Paulo. Instituto de Astronomia, Geofísica e Ciências Atmosféricas; Brasil
dc.description.fil
Fil: Santos-Lima, R.. Universidade do Sao Paulo. Instituto de Astronomia, Geofísica e Ciências Atmosféricas; Brasil
dc.description.fil
Fil: De Gouveia Dal Pino, E.M.. Universidade do Sao Paulo. Instituto de Astronomia, Geofísica e Ciências Atmosféricas; Brasil
dc.description.fil
Fil: Falceta-Gonçalves, D.A.. Universidade do Sao Paulo. Instituto de Astronomia, Geofísica e Ciências Atmosféricas; Brasil
dc.journal.title
Monthly Notices of the Royal Astronomical Society
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1093/mnras/stv2586


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