Artículo

Santos-Lima, R.; de Gouveia Dal Pino, E.M.; Falceta-Gonçalves, D.A.; Nakwacki, M.S.; Kowal, G."Features of collisionless turbulence in the intracluster medium from simulated Faraday rotation maps - II. The effects of instabilities feedback" (2017) Monthly Notices of the Royal Astronomical Society. 465(4):4866-4871
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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. © 2016 The Authors.

Registro:

Documento: Artículo
Título:Features of collisionless turbulence in the intracluster medium from simulated Faraday rotation maps - II. The effects of instabilities feedback
Autor:Santos-Lima, R.; de Gouveia Dal Pino, E.M.; Falceta-Gonçalves, D.A.; Nakwacki, M.S.; Kowal, G.
Filiación:Instituto de Astronomia, Geofísica e Ciências Atmosféricas, Universidade de São Paulo, R. do Matão, 1226, São Paulo, SP 05508-090, Brazil
Escola de Artes, Ciências e Humanidades, Universidade de São Paulo, São Paulo, SP, 03828-000, Brazil
Instituto de Astronomía y Física del Espacio, UBA-CONICET, Ciudad Universitaria, Buenos Aires, C1428ZAA, Argentina
Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, C1428EGA, Argentina
Núcleo de Astrofísica Teórica, Universidade Cruzeiro do Sul, São Paulo, SP, 01506-000, Brazil
Palabras clave:Galaxies: clusters: intracluster medium; Magnetic fields; Methods: numerical; Turbulence
Año:2017
Volumen:465
Número:4
Página de inicio:4866
Página de fin:4871
DOI: http://dx.doi.org/10.1093/mnras/stw3050
Handle:http://hdl.handle.net/20.500.12110/paper_00358711_v465_n4_p4866_SantosLima
Título revista:Monthly Notices of the Royal Astronomical Society
Título revista abreviado:Mon. Not. R. Astron. Soc.
ISSN:00358711
CODEN:MNRAA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00358711_v465_n4_p4866_SantosLima

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Citas:

---------- APA ----------
Santos-Lima, R., de Gouveia Dal Pino, E.M., Falceta-Gonçalves, D.A., Nakwacki, M.S. & Kowal, G. (2017) . Features of collisionless turbulence in the intracluster medium from simulated Faraday rotation maps - II. The effects of instabilities feedback. Monthly Notices of the Royal Astronomical Society, 465(4), 4866-4871.
http://dx.doi.org/10.1093/mnras/stw3050
---------- CHICAGO ----------
Santos-Lima, R., de Gouveia Dal Pino, E.M., Falceta-Gonçalves, D.A., Nakwacki, M.S., Kowal, G. "Features of collisionless turbulence in the intracluster medium from simulated Faraday rotation maps - II. The effects of instabilities feedback" . Monthly Notices of the Royal Astronomical Society 465, no. 4 (2017) : 4866-4871.
http://dx.doi.org/10.1093/mnras/stw3050
---------- MLA ----------
Santos-Lima, R., de Gouveia Dal Pino, E.M., Falceta-Gonçalves, D.A., Nakwacki, M.S., Kowal, G. "Features of collisionless turbulence in the intracluster medium from simulated Faraday rotation maps - II. The effects of instabilities feedback" . Monthly Notices of the Royal Astronomical Society, vol. 465, no. 4, 2017, pp. 4866-4871.
http://dx.doi.org/10.1093/mnras/stw3050
---------- VANCOUVER ----------
Santos-Lima, R., de Gouveia Dal Pino, E.M., Falceta-Gonçalves, D.A., Nakwacki, M.S., Kowal, G. Features of collisionless turbulence in the intracluster medium from simulated Faraday rotation maps - II. The effects of instabilities feedback. Mon. Not. R. Astron. Soc. 2017;465(4):4866-4871.
http://dx.doi.org/10.1093/mnras/stw3050