A Phase Lag between Disk and Corona in GRMHD Simulations of Precessing Tilted Accretion Disks

Understand

In the course of its evolution, a black hole (BH) accretes gas from a wide range of directions.

• Given a random accretion event, the typical angular momentum of an accretion disc would be tilted by $\sim$60$^\circ$ relative to the BH spin.
• Misalignment causes the disc to precess at a rate that increases with BH spin and tilt angle.
• We present the first general-relativistic magnetohydrodynamic (GRMHD) simulations spanning a full precession period of highly tilted (60$^\circ$), moderately thin ($h/r=0.1$) accretion discs around a rapidly spinning ($a\simeq0.9$) BH.