Microscopic processes in global relativistic jets containing helical magnetic fields

Ken Ichi Nishikawa, Yosuke Mizuno, Jacek Niemiec, Oleh Kobzar, Martin Pohl, Jose L. Gómez, Ioana Duţan, Asaf Pe'er, Jacob Trier Frederiksen, Åke Nordlund, Athina Meli, Helene Sol, Philip E. Hardee, Dieter H. Hartmann

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

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 (el--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.

Original languageEnglish
Article number38
JournalGalaxies
Volume4
Issue number4
DOIs
StatePublished - 1 Dec 2016
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2016 by the authors.

Keywords

  • Global jets
  • Helical magnetic fields
  • Kinetic instabilities
  • Kink instability
  • Particle-in-cell simulations
  • Relativistic jets

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