Description:

Relativistic blazar jets and black hole coronae routinely display fast and bright flares of non-thermal emission. By means of fully-kinetic particle-in-cell (PIC) simulations, we show that magnetic reconnection in the relativistic regime appropriate for blazar jets (i.e., at magnetizations sigma>>1) can satisfy all the basic conditions for the emission: extended non-thermal distributions of accelerated particles (with power-law slope between -4 and -1), efficient dissipation and rough equipartition between particles and magnetic field in the emitting region. In addition, we show that ultra-relativistic plasmoids generated by reconnection can power the ultra-fast bright flares observed from a number of TeV blazars. We also discuss electron heating and non-thermal acceleration in the trans-relativistic regime sigma~1 appropriate for the magnetized coronae of collisionless accretion flows, like Sgr A* at the center of our Galaxy.

Speaker: Lorenzo Sironi, Columbia University

Host: Sasha Tchekhovskoy

Keywords: Physics, Astronomy, Astrophysics