Environments for Magnetic Field Amplification by Cosmic Rays

Details Environments for Magnetic Field Amplification by Cosmic Rays Environments for Magnetic Field Amplification by Cosmic Rays

2009-12-17

arxiv.org/abs/0912.3511v1

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

9 pages, 8 figures; Accepted to ApJ

Scientific paper

We consider a recently discovered class of instabilities, driven by cosmic ray streaming, in a variety of environments. We show that although these instabilities have been discussed primarily in the context of supernova driven interstellar shocks, they can also operate in the intergalactic medium and in galaxies with weak magnetic fields, where, as a strong source of helical magnetic fluctuations, they could contribute to the overall evolution of the magnetic field. Within the Milky Way, these instabilities are strongest in warm ionized gas, and appear to be weak in hot, low density gas unless the injection efficiency of cosmic rays is very high.

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