Efficient acceleration of cylindrical jets: effects of radiative cooling and tangled magnetic field
arXiv:2003.06140 · doi:10.1093/mnras/staa728
Abstract
Diverging supersonic flows are accelerating, as in the case of a de Laval nozzle, and the same concept has been applied for acceleration of magnetohydrodynamic flows in the universe. Here, we study the dynamics of "non-diverging" cylindrical supersonic flows and show that they can be accelerated by effects of radiative cooling and the tangled magnetic field. In addition to radiative cooling of the jet materials (cooling effect), conversion of the ordered magnetic field into the turbulent one (conversion effect) and dissipation of the turbulent magnetic field (dissipation effect) are formulated according to our study on pulsar wind nebulae. Although each of the cooling and conversion effects is an ineffective acceleration process, the terminal velocity of magnetized cylindrical jets attains about half of the maximum possible value when the cooling, conversion and dissipation effects work simultaneously. The radiation efficiency is also about half of the total luminosity of the jet in the case of maximal acceleration. The concept for flow acceleration by the non-ideal MHD effects may be useful for studying relativistic jets in active galactic nuclei, in which the region near the jet axis is expected to be cylindrical and kink unstable.
arXiv commentAccepted for publication in MNRAS, 12 pages, 4 figures, 1 table
References in corpus (30)
- General physical properties of bright Fermi blazars
- The power of blazar jets
- Efficient acceleration and radiation in Poynting flux powered GRB outflows
- Reconnection in a striped pulsar wind
- Magnetic acceleration of ultra-relativistic jets in gamma-ray burst sources
- Magnetic acceleration of relativistic AGN jets
- The Structure and Dynamics of the Sub-parsec Scale Jet in M87 Based on 50 VLBA Observations Over 17 Years at 43 GHz
- The Structure of the M87 Jet: A Transition from Parabolic to Conical Streamlines
- Relativistic MHD simulations of core-collapse GRB jets: 3D instabilities and magnetic dissipation
- Acceleration of GRB outflows by Poynting flux dissipation
- Rapid variability in the synchrotron self Compton model for blazars
- Asymptotic structure of Poynting dominated jets
- Parabolic Jets from the Spinning Black Hole in M87
- Innermost collimation structure of the M87 jet down to ~ten Schwarzschild radii
- Magnetohydrodynamic-Particle-in-Cell Method for Coupling Cosmic Rays with a Thermal Plasma: Application to Non-relativistic Shocks
- Causality and stability of cosmic jets
- Time-Dependent Models for Blazar Emissions with the Second-Order Fermi Acceleration
- Kink instability: evolution and energy dissipation in Relativistic Force-Free Non-Rotating Jets
- On the central core in MHD winds and jets
- Turbulent magnetic relaxation in pulsar wind nebulae
- On the Radio Emitting Particles of the Crab Nebula: Stochastic Acceleration Model
- Baryon Loading of AGN Jets Mediated by Neutrons
- Efficient Acceleration of Relativistic Magnetohydrodynamic Jets
- A Mechanism for Triple-Ridge Emission Structure of AGN Jets
- Asymptotic theory of relativistic, magnetized jets
- Dissipation Efficiency of Reconfinement Shocks in Relativistic Jets
- Jet in jet in M87
- Confinement of the Crab Nebula with tangled magnetic field by its supernova remnant
- On the acceleration and deceleration of relativistic jets in active galactic nuclei - II. Mass-loading
- On the deceleration of relativistic jets in active galactic nuclei I: Radiation drag