Artículo
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 |
| 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
