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Title: Relativistic MHD simulations of collision-induced magnetic dissipation in Poynting-flux-dominated jets/outflows

Abstract

The question of the energy composition of the jets/outflows in high-energy astrophysical systems, e.g. GRBs, AGNs, is taken up first: Matter-flux-dominated (MFD), σ < 1, and/or Poynting-flux-dominated (PFD), σ >1? The standard fireball IS model and dissipative photosphere model are MFD, while the ICMART (Internal-Collision-induced MAgnetic Reconnection and Turbulence) model is PFD. Motivated by ICMART model and other relevant problems, such as “jets in a jet” model of AGNs, the author investigates the models from the EMF energy dissipation efficiency, relativistic outflow generation, and σ evolution points of view, and simulates collisions between high-σ blobs to mimic the situation of the interactions inside the PFD jets/outflows by using a 3D SRMHD code which solves the conservative form of the ideal MHD equations. σb,f is calculated from the simulation results (threshold = 1). The efficiency obtained from this hybrid method is similar to the efficiency got from the energy evolution of the simulations (35.2%). Efficiency is nearly σ independent, which is also confirmed by the hybrid method. σb,i - σb,f provides an interesting linear relationship. Results of several parameter studies of EMF energy dissipation efficiency are shown.

Authors:
 [1]
  1. Los Alamos National Laboratory
Publication Date:
Research Org.:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Laboratory Directed Research and Development (LDRD) Program
OSTI Identifier:
1196187
Report Number(s):
LA-UR-15-25572
Journal ID: ISSN 1538--4357
DOE Contract Number:  
AC52-06NA25396
Resource Type:
Conference
Resource Relation:
Journal Volume: 805; Journal Issue: 2; Conference: Plasma Energization: Exchanges between Fluid and Kinetic Scales ; 2015-05-04 - 2015-05-06 ; Los Alamos, New Mexico, United States, Melbourne (Australia), 19-25 Apr 2015
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; Astronomy and Astrophysics

Citation Formats

Deng, Wei. Relativistic MHD simulations of collision-induced magnetic dissipation in Poynting-flux-dominated jets/outflows. United States: N. p., 2015. Web. doi:10.1088/0004-637X/805/2/163.
Deng, Wei. Relativistic MHD simulations of collision-induced magnetic dissipation in Poynting-flux-dominated jets/outflows. United States. https://doi.org/10.1088/0004-637X/805/2/163
Deng, Wei. 2015. "Relativistic MHD simulations of collision-induced magnetic dissipation in Poynting-flux-dominated jets/outflows". United States. https://doi.org/10.1088/0004-637X/805/2/163. https://www.osti.gov/servlets/purl/1196187.
@article{osti_1196187,
title = {Relativistic MHD simulations of collision-induced magnetic dissipation in Poynting-flux-dominated jets/outflows},
author = {Deng, Wei},
abstractNote = {The question of the energy composition of the jets/outflows in high-energy astrophysical systems, e.g. GRBs, AGNs, is taken up first: Matter-flux-dominated (MFD), σ < 1, and/or Poynting-flux-dominated (PFD), σ >1? The standard fireball IS model and dissipative photosphere model are MFD, while the ICMART (Internal-Collision-induced MAgnetic Reconnection and Turbulence) model is PFD. Motivated by ICMART model and other relevant problems, such as “jets in a jet” model of AGNs, the author investigates the models from the EMF energy dissipation efficiency, relativistic outflow generation, and σ evolution points of view, and simulates collisions between high-σ blobs to mimic the situation of the interactions inside the PFD jets/outflows by using a 3D SRMHD code which solves the conservative form of the ideal MHD equations. σb,f is calculated from the simulation results (threshold = 1). The efficiency obtained from this hybrid method is similar to the efficiency got from the energy evolution of the simulations (35.2%). Efficiency is nearly σ independent, which is also confirmed by the hybrid method. σb,i - σb,f provides an interesting linear relationship. Results of several parameter studies of EMF energy dissipation efficiency are shown.},
doi = {10.1088/0004-637X/805/2/163},
url = {https://www.osti.gov/biblio/1196187}, journal = {},
issn = {1538--4357},
number = 2,
volume = 805,
place = {United States},
year = {Tue Jul 21 00:00:00 EDT 2015},
month = {Tue Jul 21 00:00:00 EDT 2015}
}

Conference:
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