Thermal instability and the effects of cosmic-ray diffusion

Details Thermal instability and the effects of cosmic-ray diffusion Thermal instability and the effects of cosmic-ray diffusion

Aug 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009mnras.397.1521s&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 397, Issue 3, pp. 1521-1527.

Astronomy and Astrophysics

Astronomy

6

Instabilities, Stars: Formation, Cosmic Rays

Scientific paper

We study the dynamical effects of cosmic rays (CRs) on thermal instability in the linear regime. CRs and the thermal plasma are treated as two different interacting fluids, in which CRs can diffuse along the magnetic field lines. We show that the growth rate of the magnetothermal condensation mode is reduced because of the existence of CRs, and this stabilizing effect depends on the diffusion coefficient and the ratio of CR pressure to gas pressure. Thus, a slower rate of structure formation via thermal instability is predicted when CRs are considered.

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