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arXiv:0706.1916 (astro-ph)
[Submitted on 13 Jun 2007]

Title:GRMHD/RMHD Simulations and Stability of Magnetized Spine-Sheath Relativistic Jets

Authors:Philip Hardee, Yosuke Mizuno, Ken-Ichi Nishikawa
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Abstract: A new general relativistic magnetohydrodynamics (GRMHD) code ``RAISHIN'' used to simulate jet generation by rotating and non-rotating black holes with a geometrically thin Keplarian accretion disk finds that the jet develops a spine-sheath structure in the rotating black hole case. Spine-sheath structure and strong magnetic fields significantly modify the Kelvin-Helmholtz (KH) velocity shear driven instability. The RAISHIN code has been used in its relativistic magnetohydrodynamic (RMHD) configuration to study the effects of strong magnetic fields and weakly relativistic sheath motion, c/2, on the KH instability associated with a relativistic, Lorentz factor equal 2.5, jet spine-sheath interaction. In the simulations sound speeds up to c/1.7 and Alfven wave speeds up to 0.56 c are considered. Numerical simulation results are compared to theoretical predictions from a new normal mode analysis of the RMHD equations. Increased stability of a weakly magnetized system resulting from c/2 sheath speeds and stabilization of a strongly magnetized system resulting from c/2 sheath speeds is found.
Comments: 5 pages, 5 figures, accepted for publication in Astrophysics and Space Science
Subjects: Astrophysics (astro-ph)
Cite as: arXiv:0706.1916 [astro-ph]
  (or arXiv:0706.1916v1 [astro-ph] for this version)
  https://doi.org/10.48550/arXiv.0706.1916
Journal reference: Astrophys.Space Sci.311:281-286,2007
Related DOI: https://doi.org/10.1007/s10509-007-9529-1

Submission history

From: Philip E. Hardee [view email]
[v1] Wed, 13 Jun 2007 14:44:09 UTC (360 KB)
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