The influence of cosmic-rays on the magnetorotational instability

Details The influence of cosmic-rays on the magnetorotational instability The influence of cosmic-rays on the magnetorotational instability

2011-08-08

arxiv.org/abs/1108.1687v1

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

Accepted for publication in Astrophysics & Space Science

Scientific paper

We present a linear perturbation analysis of the magnetorotational instability in the presence of the cosmic rays. Dynamical effects of the cosmic rays are considered by a fluid description and the diffusion of cosmic rays is only along the magnetic field lines. We show an enhancement in the growth rate of the unstable mode because of the existence of cosmic rays. But as the diffusion of cosmic rays increases, we see that the growth rate decreases. Thus, cosmic rays have a destabilizing role in the magnetorotational instability of the accretion discs.

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