Journal
ASTROPHYSICAL JOURNAL
Volume 709, Issue 2, Pages 1412-1419Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/709/2/1412
Keywords
cosmic rays; instabilities; magnetic fields
Categories
Funding
- NSF [AST 0507367, PHY 0821899, AST 0907837]
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [0907837] Funding Source: National Science Foundation
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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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