On the MHD Acceleration of Astrophysical Jets

Details On the MHD Acceleration of Astrophysical Jets On the MHD Acceleration of Astrophysical Jets

Sep 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004ap%26ss.293...99z&link_type=abstract

Astrophysics and Space Science, v. 293, Issue 1, p. 99-106 (2004).

Astronomy and Astrophysics

Astrophysics

6

Accretion Disks, Jets And Outflows, Magnetohydrodynamics

Scientific paper

We present a 2.5D magnetohydrodynamic (MHD) simulation of the acceleration of a collimated jet from a magnetized accretion disk. We employ a MHD Adaptive Mesh Refinement (AMR) code (FLASH—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 a Keplerian disk, thus with no accretion motions, is threaded by a uniform poloidal magnetic field, we show how both the accretion flow and the acceleration of the outflow occur, and we present in detail which are the forces responsible for the jet launching and collimation. Our simulation also shows how the collimating forces due to the self-generated toroidal magnetic field can produce some peculiar knotty features.

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