Rossby Vortices in Thin Magnetized Accretion Discs
Earth and Planetary Astrophysics
2018-08-29 v2
Abstract
We study the Rossby wave instability (RWI) in a thin accretion disc threaded by an initially toroidal magnetic field using the magnetohydrodynamics (MHD) code PLUTO. We find that for plasma , the growth rate and late-time density are suppressed, whereas for plasma , the magnetic field has negligible effect. The initially toroidal field is twisted inside the vortex and expelled at late times. This creates a radially directed field outside the vortex region, which can be understood via a simple kinematic model of a magnetic field in a rotating fluid and may be observable via polarised dust emission.
Cite
@article{arxiv.1711.08849,
title = {Rossby Vortices in Thin Magnetized Accretion Discs},
author = {Loren Matilsky and Sergei Dyda and Richard V. E. Lovelace and Patrick Lii},
journal= {arXiv preprint arXiv:1711.08849},
year = {2018}
}
Comments
10 pages, 10 figures