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dc.contributor.author
Lima, R. Santos
dc.contributor.author
Pino, E. M. de Gouveia Dal
dc.contributor.author
Falceta Gonçalves, D. A.
dc.contributor.author
Nakwacki, Maria Soledad
dc.contributor.author
Kowal, G.
dc.date.available
2017-06-14T18:23:28Z
dc.date.issued
2017-03
dc.identifier.citation
Lima, R. Santos; Pino, E. M. de Gouveia Dal; Falceta Gonçalves, D. A.; Nakwacki, Maria Soledad; Kowal, G.; Features of collisionless turbulence in the intracluster medium from simulated Faraday rotation maps - II. The effects of instabilities feedback; Oxford University Press; Monthly Notices Of The Royal Astronomical Society; 465; 4; 3-2017; 4866-4871
dc.identifier.issn
0035-8711
dc.identifier.uri
http://hdl.handle.net/11336/18174
dc.description.abstract
Statistical analysis of Faraday rotation measure (RM) maps of the intracluster medium (ICM) of galaxy clusters provides a unique tool to evaluate some spatial features of the magnetic fields there. Its combination with numerical simulations of magnetohydrodynamic (MHD) turbulence allows the diagnosis of the ICM turbulence. Being the ICM plasma weakly collisional, the thermal velocity distribution of the particles naturally develops anisotropies as a consequence of the large-scale motions and the conservation of the magnetic moment of the charged particles. A previous study (Paper I) analysed the impact of large-scale thermal anisotropy on the statistics of RM maps synthesized from simulations of turbulence; these simulations employed a collisionless MHD model that considered a tensor pressure with uniform anisotropy. In this work, we extend that analysis to a collisionless MHD model in which the thermal anisotropy develops according to the conservation of the magnetic moment of the thermal particles. We also consider the effect of anisotropy relaxation caused by the microscale mirror and firehose instabilities. We show that if the relaxation rate is fast enough to keep the anisotropy limited by the threshold values of the instabilities, the dispersion and power spectrum of the RM maps are indistinguishable from those obtained from collisional MHD. Otherwise, there is a reduction in the dispersion and steepening of the power spectrum of the RM maps (compared to the collisional case). Considering the first scenario, the use of collisional MHD simulations for modelling the RM statistics in the ICM becomes better justified.
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
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Magnetic Fields
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Methods: Numerical
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Turbulence
dc.subject.classification
Astronomía
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Ciencias Físicas
dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
dc.title
Features of collisionless turbulence in the intracluster medium from simulated Faraday rotation maps - II. The effects of instabilities feedback
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2017-06-13T14:15:14Z
dc.journal.volume
465
dc.journal.number
4
dc.journal.pagination
4866-4871
dc.journal.pais
Reino Unido
dc.journal.ciudad
Oxford
dc.description.fil
Fil: Lima, R. Santos. Universidade de Sao Paulo; Brasil
dc.description.fil
Fil: Pino, E. M. de Gouveia Dal. Universidade de Sao Paulo; Brasil
dc.description.fil
Fil: Falceta Gonçalves, D. A.. Universidade de Sao Paulo; Brasil
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
dc.description.fil
Fil: Kowal, G.. Universidade Cruzeiro Do Sul; . Universidade de Sao Paulo; Brasil
dc.journal.title
Monthly Notices Of The Royal Astronomical Society
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://academic.oup.com/mnras/article-abstract/465/4/4866/2573011/Features-of-collisionless-turbulence-in-the?redirectedFrom=fulltext
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1093/mnras/stw3050
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