An Isaac Newton Institute Workshop

Supported by the European Commission, Sixth Framework Programme - Marie Curie Conferences and Training Courses - MSCF-CT-2003-503674 <br><br> Large-Scale Computation in Astrophysics

AMR simulations of supersonic magnetized jet acceleration from accretion disks

Authors: Attilio Ferrari (University of Torino), Claudio Zanni (University of Torino), Silvano Massaglia (University of Torino), Gianluigi Bodo (Astronomical Observatory of Torino)

Abstract

We present a 2.5D magnetohydrodynamic (MHD) simulation of the acceleration of a collimated jet from a magnetized accretion disk employing a MHD code with Adaptive Mesh Refinement (FLASH code -- University of Chicago). Thanks to this tool we can follow the evolution of the system for many dynamical timescales with a high spatial resolution. Assuming an initial condition in which an equilibrium Keplerian disk is threaded by a uniform azimuthal magnetic field, we show how both the accretion inflow and the acceleration of the outflow occur and we present in great detail which are the forces responsible for the launch and the collimation of the jet. Our simulation also shows how the collimating forces due to the self-generated toroidal magnetic field can produce some peculiar knotty features.