Krzysztof Nalewajko

Centrum Astronomiczne im. M. Kopernika PAN

Sesja V: Astrofizyka wysokich energii

Środa 13.09.2023 11:30 – 11:45

abstrakt:
Black holes acquire relativistic magnetospheres by accreting magnetized gas.
Once they collect significant magnetic flux across the horizon, aided by spin, they can drive powerful relativistic jets by the Blandford-Znajek mechanism.
Large enough black hole magnetic fluxes may arrest or choke the accretion flow. Recently, magnetic flux eruptions have been identified as a mechanism of black hole magnetic flux saturation. These eruptions can potentially dissipate a large fraction of magnetic energy in the black hole magnetosphere by means of magnetic reconnection, accelerating particles and producing flares of non-thermal radiation. We analyze the results of 3D GRMHD numerical simulations of magnetically choked accretion flows at Kerr black holes, focusing on the episodes of major magnetic flux eruptions. We focus on describing the sequence of events that lead to trigerring the magnetic flux eruptions.