Volume 463, Number 1, February III 2007
|Page(s)||195 - 201|
|Section||Interstellar and circumstellar matter|
|Published online||20 November 2006|
Two-fluid models of cosmic-ray modified radiative shocks including the effects of an acoustic instability
School of Physics and Astronomy, University of Leeds LS2 9JT, UK e-mail: email@example.com
2 Department of Applied Mathematics, University of Leeds, Leeds LS2 9JT, UK
Accepted: 27 October 2006
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.
Key words: shock waves / ISM: cosmic rays / hydrodynamics / instabilities / ISM: supernova remnants
© ESO, 2007
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.