Two-fluid models of cosmic-ray modified radiative shocks including the effects of an acoustic instability

Details Two-fluid models of cosmic-ray modified radiative shocks including the effects of an acoustic instability Two-fluid models of cosmic-ray modified radiative shocks including the effects of an acoustic instability

Feb 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007a%26a...463..195w&link_type=abstract

Astronomy and Astrophysics, Volume 463, Issue 1, February III 2007, pp.195-201

Astronomy and Astrophysics

Astrophysics

4

Shock Waves, Ism: Cosmic Rays, Hydrodynamics, Instabilities, Ism: Supernova Remnants

Scientific paper

Aims:We extend the study of two-fluid models of cosmic-ray modified radiative shocks by including energy transfer from the cosmic rays to the thermal gas due to a cosmic-ray driven acoustic instability. Methods: We perform hydrodynamic simulations to find solutions to the time-dependent, one-dimensional two-fluid equations governing the thermal fluid and cosmic-ray fluid. Source terms transferring energy between the two fluids are included. Results: The magnitudes of the source terms determine the degree to which the cosmic rays modify the radiative shock. We found a range of steady solutions characterised by moderate cosmic-ray acceleration and a compression ratio significantly greater than 7, which is the limit for cosmic-ray dominated shocks. The post-shock temperature and overall compression increase as the source term in the thermal fluid's energy equation increases. For sufficiently strong coupling, the solutions are thermally overstable.

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