Abstract
It is believed that some astrophysical systems have very low angular momentum gas accreting on a spinning black hole, such as tidal disruption events, long gamma-ray bursts and wind-fed high mass X-ray binaries. It is unclear whether such accretion flows can accumulate and trap enough magnetic fluxes in the inner region to launch the most powerful jets. The talk will give a computational perspective on the behaviour of magnetized Bondi-like accretion flow with no or very low angular momentum. 3D general relativistic magnetohydrodynamic simulations have been performed. I will present the models and the first results from the simulations. I will demonstrate that the initial gas angular momentum impacts whether the disk can reach the magnetically arrested (MAD) state, and stably launch powerful jets, although only a small threshold angular momentum is needed. Our results give plausible explanations for why jets can be produced from various astrophysical systems with slowly rotating accretion flows.
Anyone interested is welcome to attend.