Abstract
The turbulent magnetic field produced by clustered supernova explosions
Mattia Pacicco
Technische Universität Berlin
Supernova remnants (SNR) are the result of the interaction between stellar material ejected at high velocity by supernova explosions (SN) and the surrounding interstellar medium (ISM). The shock waves produced by the explosions heat the gas surrounding them and compresses the ISM in dense shells. While these objects often evolve in isolation, in large OB associations many SNe can occur in sequence, close in both space and time. The effect of these explosions adds up in a non-linear fashion, leading to the formation of very large structures known as super bubbles (SBs). As the OB association continues to move over several million years (10-40 Myr), stars that have not yet exploded as SNe also move. This causes the sequential explosions to be off-centred. The consequence of off-cenetered SNe in the hot interior of the superbubble is the driving of turbulence in the gas, which also generates a highly turbulent magnetic field. We present the turbulent magnetic field resulting from high-resolution 3D magneto-hydrodynamic simulations of cluster supernova explosions in a magnetized, vertically stratified ISM.