Preprint Article Version 1 NOT YET PEER-REVIEWED

Microscopic Processes In Global Relativistic Jets Containing Helical Magnetic Fields

Version 1 : Received: 13 July 2016 / Approved: 13 July 2016 / Online: 13 July 2016 (05:37:49 CEST)

A peer-reviewed article of this Preprint also exists.

Nishikawa, K.-I.; Mizuno, Y.; Niemiec, J.; Kobzar, O.; Pohl, M.; Gómez, J.L.; Duţan, I.; Pe’er, A.; Frederiksen, J.T.; Nordlund, Å.; Meli, A.; Sol, H.; Hardee, P.E.; Hartmann, D.H. Microscopic Processes in Global Relativistic Jets Containing Helical Magnetic Fields. Galaxies 2016, 4, 38. Nishikawa, K.-I.; Mizuno, Y.; Niemiec, J.; Kobzar, O.; Pohl, M.; Gómez, J.L.; Duţan, I.; Pe’er, A.; Frederiksen, J.T.; Nordlund, Å.; Meli, A.; Sol, H.; Hardee, P.E.; Hartmann, D.H. Microscopic Processes in Global Relativistic Jets Containing Helical Magnetic Fields. Galaxies 2016, 4, 38.

Journal reference: Galaxies 2016, 4, 38
DOI: 10.3390/galaxies4040038

Abstract

In the study of relativistic jets one of the key open questions is their interaction with the
environment on the microscopic level. Here, we study the initial evolution of both electron–proton
(e- - p+) and electron–positron (e±) relativistic jets containing helical magnetic fields, focusing on
their interaction with an ambient plasma. We have performed simulations of "global" jets containing
helical magnetic fields in order to examine how helical magnetic fields affect kinetic instabilities
such as the Weibel instability, the kinetic Kelvin-Helmholtz instability (kKHI) and the Mushroom
instability (MI). In our initial simulation study these kinetic instabilities are suppressed and new
types of instabilities can grow. In the e- - p+ jet simulation recollimation-like instability occurs and
jet electrons are strongly perturbed. In the e± jet simulation a recollimation-like instability occurs
at early times followed by a kinetic instability and the general structure is similar to a simulation
without helical magnetic field. Simulations using much larger systems are required in order to
thoroughly follow the evolution of global jets containing helical magnetic fields.

Subject Areas

relativistic jets; particle-in-cell simulations; global jets; helical magnetic fields; kinetic instabilities; kink instability

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