A simple analytical model of magnetic jets

Abstract

We propose a simple analytical jet model of magnetic jets, in which radially-averaged profiles of main physical quantities are obtained based on conservation laws and some results of published GRMHD jet simulations. We take into account conversion of the magnetic energy flux to bulk acceleration in jets formed around rotating black holes assuming the mass continuity equation and constant jet power, which leads to the Bernoulli equation. For assumed profiles of the bulk Lorentz factor and the radius, this gives us the profile of the toroidal magnetic field component along the jet. We then consider the case where the poloidal field component is connected to a rotating black hole surrounded by an accretion disc. Our formalism then recovers the standard formula for the power extracted from a rotating black hole. We find that the poloidal field strength dominates over the toroidal one in the comoving frame up to large distances, which means that jets should be more stable to current-driven kink modes. The resulting magnetic field profiles can then be used to calculate the jet synchrotron emission.

MNRAS, Letters, in press

References in corpus (11)

• The power of relativistic jets is larger than the luminosity of their accretion disks
• Magnetic acceleration of ultra-relativistic jets in gamma-ray burst sources
• Magnetic acceleration of relativistic AGN jets
• Magnetohydrodynamic Simulations of Active Galactic Nucleus Disks and Jets
• Opening angles, Lorentz factors and confinement of X-ray binary jets
• The power and production efficiency of blazar jets
• Radiative Properties of Magnetically-Arrested Disks
• Correlating spectral and timing properties in the evolving jet of the micro blazar MAXI J1836-194
• The Composition and Power of the Jet of the Broad-Line Radio Galaxy 3C 120
• Observational Signatures of Mass-Loading in Jets Launched by Rotating Black Holes
• The prototype X-ray binary GX 339-4: using TeV gamma-rays to assess LMXBs as Galactic cosmic ray accelerators

Cited by in corpus (2)

• Multi-messenger characterization of Mrk 501 during historically low X-ray and $\gamma$-ray activity
• On the evolution of the particle distribution and the cascade in a moving, expanding emission region in blazar jets