Magnetically Modified Spherical Accretion in GRMHD: Reconnection-Driven Convection and Jet Propagation

Understand

We present 3D general relativistic magnetohydrodynamic(GRMHD) simulations of zero angular momentum accretion around a rapidly rotating black hole, modified by the presence of initially uniform magnetic fields.

• We consider serveral angles between the magnetic field direction and the black hole spin.
• In the resulting flows, the midplane dynamics are governed by magnetic reconnection-driven turbulence in a magnetically arrested (or a nearly arrested) state.
• Electromagnetic jets with outflow efficiencies ~10-200% occupy the polar regions, reaching several hundred gravitational radii before they dissipate due to the kink instability.