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Galaxies 2016, 4(4), 40; doi:10.3390/galaxies4040040

Magnetic Dissipation in Relativistic Jets

1
Institute for Theoretical Physics, Goethe University, D-60438 Frankfurt am Main, Germany
2
Instituto de Astrofísica de Andalucía (CSIC), 18080 Granada, Spain
3
Department of Physics, University of Alabama in Huntsville, Huntsville, AL 35899, USA
4
Department of Physics and Astronomy, University of Gent, B-9000 Gent, Belgium
5
Department of Physics and Astronomy, The University of Alabama, Tuscaloosa, AL 35487, USA
6
Frankfurt Institute for Advanced Studies, D-60438 Frankfurt am Main, Germany
7
Department of Astronomy (IAG-USP), University of São Paulo, São Paulo SP 05508-090, Brazil
*
Author to whom correspondence should be addressed.
Received: 27 July 2016 / Revised: 22 September 2016 / Accepted: 26 September 2016 / Published: 7 October 2016
(This article belongs to the Special Issue Blazars through Sharp Multi-wavelength Eyes)
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Abstract

The most promising mechanisms for producing and accelerating relativistic jets, and maintaining collimated structure of relativistic jets involve magnetohydrodynamical (MHD) processes. We have investigated the magnetic dissipation mechanism in relativistic jets via relativistic MHD simulations. We found that the relativistic jets involving a helical magnetic field are unstable for the current-driven kink instability, which leads to helically distorted structure in relativistic jets. We identified the regions of high current density in filamentary current sheets, indicative of magnetic reconnection, which are associated to the kink unstable regions and correlated to the converted regions of magnetic to kinetic energies of the jets. We also found that an over-pressured relativistic jet leads to the generation of a series of stationary recollimation shocks and rarefaction structures by the nonlinear interaction of shocks and rarefaction waves. The differences in the recollimation shock structure due to the difference of the magnetic field topologies and strengths may be observable through mm-VLBI observations and space-VLBI mission. View Full-Text
Keywords: galaxies: jets; magnetohydrodynamics (MHD); methods: numerical; instabilities; shock waves galaxies: jets; magnetohydrodynamics (MHD); methods: numerical; instabilities; shock waves
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Mizuno, Y.; Gómez, J.L.; Nishikawa, K.-I.; Meli, A.; Hardee, P.E.; Rezzolla, L.; Singh, C.B.; Pino, E.M.G.D. Magnetic Dissipation in Relativistic Jets. Galaxies 2016, 4, 40.

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