GRMHD/RMHD simulations & stability of magnetized spine-sheath relativistic jets |
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Authors: | Philip Hardee Yosuke Mizuno Ken-Ichi Nishikawa |
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Institution: | (1) The University of Alabama (UA), Tuscaloosa, AL 35487, USA;(2) National Space Science & Technology Center (NSSTC), Huntsville, AL 35805, USA;(3) NASA/Marshall Space Flight Center (NASA/MSFC), Huntsville, AL 35805, USA;(4) University of Alabama at Huntsville (UAH), Huntsville, AL 35805, USA |
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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, γ=2.5, jet spine-sheath interaction. In the simulations sound speeds up to
and Alfvén wave speeds up to ∼0.56c 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. |
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Keywords: | Galaxies: jets Gamma rays: bursts ISM: jets and outflows Methods: analytical MHD Relativity Instabilities |
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