Microscopic processes in global relativistic jets containing helical magnetic fields
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Published Version
Date
2016-09-29
Authors
Nishikawa, Ken-Ichi
Mizuno, Yosuke
Niemiec, Jacek
Kobzar, Oleh
Pohl, Martin
Gómez, Jose L.
Duţan, Ioana
Pe’er, Asaf
Frederiksen, Jacob Trier
Nordlund, Åke
Journal Title
Journal ISSN
Volume Title
Publisher
Multidisciplinary Digital Publishing Institute
Published Version
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 a 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.
Description
Keywords
Relativistic jets , Particle-in-cell simulations , Global jets , Helical magnetic fields , Kinetic instabilities , Kink instability
Citation
Nishikawa, K.I., Mizuno, Y., Niemiec, J., Kobzar, O., Pohl, M., Gómez, J.L., Duţan, I., Pe’er, A., Frederiksen, J.T., Nordlund, Å. and Meli, A. (2016) 'Microscopic processes in global relativistic jets containing helical magnetic fields', Galaxies, 4(4), 38 (9pp). doi: 10.3390/galaxies4040038