Efficient Acceleration of Relativistic Magnetohydrodynamic Jets
arXiv:1303.2744 · doi:10.1093/ptep/ptt058
Abstract
Relativistic jets in active galactic nuclei, galactic microquasars, and gamma-ray bursts are widely considered to be magnetohydrodynamically driven by black hole accretion systems, although conversion mechanism from Poynting into particle kinetic energy flux is still open. Recent detailed numerical and analytical studies of global structures of steady, axisymmetric magnetohydrodynamic (MHD) flows with specific boundary conditions have not reproduced as rapid an energy conversion as required by observations. In order to find more suitable boundary conditions, we focus on the flow along a poloidal magnetic field line just inside the external boundary, without treating transfield force balance in detail. We find some examples of the poloidal field structure and corresponding external pressure profile for an efficient and rapid energy conversion as required by observations, and that the rapid acceleration requires a rapid decrease of the external pressure above the accretion disk. We also clarify the differences between the fast magnetosonic point of the MHD flow and the sonic point of de Laval nozzle.
18 pages, 7 figures, PTEP accepted
References in corpus (6)
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- Magnetic acceleration of relativistic AGN jets
- A Reconnection Switch to Trigger Gamma-Ray Burst Jet Dissipation
- Formation of black hole and accretion disk in a massive high-entropy stellar core collapse
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- Efficient acceleration of cylindrical jets: effects of radiative cooling and tangled magnetic field
- Nonuniform Particle Injection into Black Hole Jets by Radiative Magnetic Reconnection