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

Abstract

We perform 3D relativistic ideal MHD simulations to study the collisions between high-σ (Poynting- ux-dominated) blobs which contain both poloidal and toroidal magnetic field components. This is meant to mimic the interactions inside a highly variable Poynting- ux-dominated jet. We discover a significant electromagnetic field (EMF) energy dissipation with an Alfvenic rate with the efficiency around 35%. Detailed analyses show that this dissipation is mostly facilitated by the collision-induced magnetic reconnection. Additional resolution and parameter studies show a robust result that the relative EMF energy dissipation efficiency is nearly independent of the numerical resolution or most physical parameters in the relevant parameter range. The reconnection outflows in our simulation can potentially form the multi-orientation relativistic mini-jets as needed for several analytical models. We also find a linear relationship between the σ values before and after the major EMF energy dissipation process. In conclusion, our results give support to the proposed astrophysical models that invoke signi cant magnetic energy dissipation in Poynting- ux-dominated jets, such as the internal collision-induced magnetic reconnection and turbulence (ICMART) model for GRBs, and reconnection triggered mini-jets model for AGNs.

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3];  [2]
  1. Univ. of Nevada, Las Vegas, NV (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. Univ. of Nevada, Las Vegas, NV (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES)
OSTI Identifier:
1254837
Report Number(s):
LA-UR-15-20564
Journal ID: ISSN 1538-4357
Grant/Contract Number:  
AC52-06NA25396; NNX15AK85G; NNX14AF85G
Resource Type:
Accepted Manuscript
Journal Name:
The Astrophysical Journal (Online)
Additional Journal Information:
Journal Name: The Astrophysical Journal (Online); Journal Volume: 805; Journal Issue: 2; Journal ID: ISSN 1538-4357
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; magnetic fields; gamma-ray burst; magnetohydrodynamics (MHD)

Citation Formats

Deng, Wei, Li, Hui, Zhang, Bing, and Li, Shengtai. 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, Li, Hui, Zhang, Bing, & Li, Shengtai. 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, Li, Hui, Zhang, Bing, and Li, Shengtai. Fri . "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/1254837.
@article{osti_1254837,
title = {Relativistic MHD simulations of collision-induced magnetic dissipation in poynting-flux-dominated jets/outflows},
author = {Deng, Wei and Li, Hui and Zhang, Bing and Li, Shengtai},
abstractNote = {We perform 3D relativistic ideal MHD simulations to study the collisions between high-σ (Poynting- ux-dominated) blobs which contain both poloidal and toroidal magnetic field components. This is meant to mimic the interactions inside a highly variable Poynting- ux-dominated jet. We discover a significant electromagnetic field (EMF) energy dissipation with an Alfvenic rate with the efficiency around 35%. Detailed analyses show that this dissipation is mostly facilitated by the collision-induced magnetic reconnection. Additional resolution and parameter studies show a robust result that the relative EMF energy dissipation efficiency is nearly independent of the numerical resolution or most physical parameters in the relevant parameter range. The reconnection outflows in our simulation can potentially form the multi-orientation relativistic mini-jets as needed for several analytical models. We also find a linear relationship between the σ values before and after the major EMF energy dissipation process. In conclusion, our results give support to the proposed astrophysical models that invoke signi cant magnetic energy dissipation in Poynting- ux-dominated jets, such as the internal collision-induced magnetic reconnection and turbulence (ICMART) model for GRBs, and reconnection triggered mini-jets model for AGNs.},
doi = {10.1088/0004-637X/805/2/163},
journal = {The Astrophysical Journal (Online)},
number = 2,
volume = 805,
place = {United States},
year = {Fri May 29 00:00:00 EDT 2015},
month = {Fri May 29 00:00:00 EDT 2015}
}

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