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Title: Jet formation driven by the expansion of magnetic bridges between the ergosphere and the disk around a rapidly rotating black hole

Abstract

We report two-dimensional numerical results of jet formation driven by a magnetic field due to a current loop near a rapidly rotating black hole. We initially set the current loop along the intersection of the equatorial plane and the surface of the ergosphere around the black hole. In such magnetic configurations, there are magnetic flux tubes which bridge the region between the ergosphere and the corotating disk. The magnetic flux tube, which we call a 'magnetic bridge', is twisted rapidly by the plasma in the ergosphere due to the frame-dragging effect. The magnetic pressure of the magnetic flux tube increases and the strong magnetic pressure blows off the plasma near the ergosphere to form outflow. The outflow is pinched by the magnetic tension of the magnetic flux tube. Then, eventually, the jet is formed. That is, the magnetic bridges cannot be stationary, and they expand explosively to form a jet. The parameter survey of the background pressure shows that the radius of the collimated jet depends on the gas pressure of the corona. However, this does not mean the gas pressure collimates the jet. The gas pressure decelerates the jet and the pinch effect by the magnetic field becomes significant.

Authors:
; ;  [1]
  1. Kumamoto University, 2-39-1, Kurokami, Kumamoto 860-8555 (Japan)
Publication Date:
OSTI Identifier:
20870983
Resource Type:
Journal Article
Journal Name:
Physical Review. D, Particles Fields
Additional Journal Information:
Journal Volume: 74; Journal Issue: 4; Other Information: DOI: 10.1103/PhysRevD.74.044005; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0556-2821
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; BLACK HOLES; ELECTRIC CURRENTS; EXPANSION; MAGNETIC FIELDS; MAGNETIC FLUX; PINCH EFFECT; PLASMA JETS

Citation Formats

Koide, Shinji, Kudoh, Takahiro, Shibata, Kazunari, Division of Theoretical Astronomy, National Astronomical Observatory of Japan, Mitaka, Tokyo 181-8588, and Kwasan and Hida Observatories, Kyoto University, Yamashina, Kyoto 607-8417. Jet formation driven by the expansion of magnetic bridges between the ergosphere and the disk around a rapidly rotating black hole. United States: N. p., 2006. Web. doi:10.1103/PHYSREVD.74.044005.
Koide, Shinji, Kudoh, Takahiro, Shibata, Kazunari, Division of Theoretical Astronomy, National Astronomical Observatory of Japan, Mitaka, Tokyo 181-8588, & Kwasan and Hida Observatories, Kyoto University, Yamashina, Kyoto 607-8417. Jet formation driven by the expansion of magnetic bridges between the ergosphere and the disk around a rapidly rotating black hole. United States. https://doi.org/10.1103/PHYSREVD.74.044005
Koide, Shinji, Kudoh, Takahiro, Shibata, Kazunari, Division of Theoretical Astronomy, National Astronomical Observatory of Japan, Mitaka, Tokyo 181-8588, and Kwasan and Hida Observatories, Kyoto University, Yamashina, Kyoto 607-8417. 2006. "Jet formation driven by the expansion of magnetic bridges between the ergosphere and the disk around a rapidly rotating black hole". United States. https://doi.org/10.1103/PHYSREVD.74.044005.
@article{osti_20870983,
title = {Jet formation driven by the expansion of magnetic bridges between the ergosphere and the disk around a rapidly rotating black hole},
author = {Koide, Shinji and Kudoh, Takahiro and Shibata, Kazunari and Division of Theoretical Astronomy, National Astronomical Observatory of Japan, Mitaka, Tokyo 181-8588 and Kwasan and Hida Observatories, Kyoto University, Yamashina, Kyoto 607-8417},
abstractNote = {We report two-dimensional numerical results of jet formation driven by a magnetic field due to a current loop near a rapidly rotating black hole. We initially set the current loop along the intersection of the equatorial plane and the surface of the ergosphere around the black hole. In such magnetic configurations, there are magnetic flux tubes which bridge the region between the ergosphere and the corotating disk. The magnetic flux tube, which we call a 'magnetic bridge', is twisted rapidly by the plasma in the ergosphere due to the frame-dragging effect. The magnetic pressure of the magnetic flux tube increases and the strong magnetic pressure blows off the plasma near the ergosphere to form outflow. The outflow is pinched by the magnetic tension of the magnetic flux tube. Then, eventually, the jet is formed. That is, the magnetic bridges cannot be stationary, and they expand explosively to form a jet. The parameter survey of the background pressure shows that the radius of the collimated jet depends on the gas pressure of the corona. However, this does not mean the gas pressure collimates the jet. The gas pressure decelerates the jet and the pinch effect by the magnetic field becomes significant.},
doi = {10.1103/PHYSREVD.74.044005},
url = {https://www.osti.gov/biblio/20870983}, journal = {Physical Review. D, Particles Fields},
issn = {0556-2821},
number = 4,
volume = 74,
place = {United States},
year = {Tue Aug 15 00:00:00 EDT 2006},
month = {Tue Aug 15 00:00:00 EDT 2006}
}