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Abstract:

The amplification of magnetic fields (MFs) in the intracluster medium (ICM) is attributed to turbulent dynamo (TD) action, which is generally derived in the collisional-MHD framework. However, this assumption is poorly justified a priori, since in the ICM the ion mean free path between collisions is of the order of the dynamical scales, thus requiring a collisionless MHD description. The present study uses an anisotropic plasma pressure that brings the plasma within a parametric space where collisionless instabilities take place. In this model, a relaxation term of the pressure anisotropy simulates the feedback of the mirror and firehose instabilities, in consistency with empirical studies. Our three-dimensional numerical simulations of forced transonic turbulence, aiming the modeling of the turbulent ICM, were performed for different initial values of the MF intensity and different relaxation rates of the pressure anisotropy. We found that in the high-β plasma regime corresponding to the ICM conditions, a fast anisotropy relaxation rate gives results that are similar to the collisional-MHD model, as far as the statistical properties of the turbulence are concerned. Also, the TD amplification of seed MFs was found to be similar to the collisional-MHD model. The simulations that do not employ the anisotropy relaxation deviate significantly from the collisional-MHD results and show more power at the small-scale fluctuations of both density and velocity as a result of the action of the instabilities. For these simulations, the large-scale fluctuations in the MF are mostly suppressed and the TD fails in amplifying seed MFs. © 2014. The American Astronomical Society. All rights reserved.

Registro:

Documento: Artículo
Título:Magnetic field amplification and evolution in turbulent collisionless magnetohydrodynamics: An application to the intracluster medium
Autor:Santos-Lima, R.; De Gouveia Dal Pino, E.M.; Kowal, G.; Falceta-Gonçalves, D.; Lazarian, A.; Nakwacki, M.S.
Filiación:Instituto de Astronomia, Geofísica e Ciências Atmosféricas, Universidade de São Paulo, R. do Matão, São Paulo, SP 05508-090 1226, Brazil
Escola de Artes, Ciências e Humanidades, Universidade de São Paulo, Rua Arlindo Bettio, São Paulo, SP 03828-000 1000, Brazil
SUPA, School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews Fife KY16 9SS, United Kingdom
Department of Astronomy, University of Wisconsin, Madison, WI 53706, United States
Instituto de Astronomía y Física Del Espacio (IAFE), CONICET, Argentina
FCEN, University of Buenos Aires, Argentina
Idioma: Inglés
Palabras clave:galaxies: clusters: intracluster medium; magnetic fields; magnetohydrodynamics (MHD); turbulence
Año:2014
Volumen:781
Número:2
Número de artículo:84
DOI: http://dx.doi.org/10.1088/0004-637X/781/2/84
Título revista:Astrophysical Journal
Título revista abreviado:Astrophys. J.
ISSN:0004637X
PDF:http://digital.bl.fcen.uba.ar/Download/paper/paper_0004637X_v781_n2_p_SantosLima.pdf
Registro:http://digital.bl.fcen.uba.ar/collection/paper/document/paper_0004637X_v781_n2_p_SantosLima

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Citas:

---------- APA ----------
Santos-Lima, R., De Gouveia Dal Pino, E.M., Kowal, G., Falceta-Gonçalves, D., Lazarian, A. & Nakwacki, M.S. (2014) . Magnetic field amplification and evolution in turbulent collisionless magnetohydrodynamics: An application to the intracluster medium. Astrophysical Journal, 781(2).
http://dx.doi.org/10.1088/0004-637X/781/2/84
---------- CHICAGO ----------
Santos-Lima, R., De Gouveia Dal Pino, E.M., Kowal, G., Falceta-Gonçalves, D., Lazarian, A., Nakwacki, M.S. "Magnetic field amplification and evolution in turbulent collisionless magnetohydrodynamics: An application to the intracluster medium" . Astrophysical Journal 781, no. 2 (2014).
http://dx.doi.org/10.1088/0004-637X/781/2/84
---------- MLA ----------
Santos-Lima, R., De Gouveia Dal Pino, E.M., Kowal, G., Falceta-Gonçalves, D., Lazarian, A., Nakwacki, M.S. "Magnetic field amplification and evolution in turbulent collisionless magnetohydrodynamics: An application to the intracluster medium" . Astrophysical Journal, vol. 781, no. 2, 2014.
http://dx.doi.org/10.1088/0004-637X/781/2/84
---------- VANCOUVER ----------
Santos-Lima, R., De Gouveia Dal Pino, E.M., Kowal, G., Falceta-Gonçalves, D., Lazarian, A., Nakwacki, M.S. Magnetic field amplification and evolution in turbulent collisionless magnetohydrodynamics: An application to the intracluster medium. Astrophys. J. 2014;781(2).
http://dx.doi.org/10.1088/0004-637X/781/2/84