Strongly magnetized accretion with low angular momentum produces a weak jet

Hot accretion flows, which are believed to operate around low-luminosity galactic nuclei, are often associated with the presence of strong outflows, winds, and jets. However, Sagittarius A* — the closest low-luminosity supermassive black hole, located at the center of our galaxy — appears to lack a powerful jet. In this talk, I will describe a simplified model of spherical accretion that provides insight into why such systems might fail to produce strong jets. Using global General Relativistic Magnetohydrodynamic simulations, I investigate the spherical accretion of magnetized plasma onto a supermassive black hole. These simulations reveal that black hole-driven feedback, in the form of magnetic flux eruptions, induces magnetized turbulence in the surrounding medium. Consequently, the formation of magnetically arrested disks and the emergence of powerful jets are not generic outcomes of the accretion of magnetized plasma.

Note the change in time (4 pm). It will be given on Zoom.

Zoom Link:

https://zoom.us/j/9290951953