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Astron. Astrophys. 344, 675-680 (1999)

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The strengths of termination shocks in magnetized mass-loaded flows

R.J.R. Williams, J.E. Dyson and T.W. Hartquist

Department of Physics and Astronomy, The University, Leeds, England LS2 9JT, UK

Received 5 October 1998 / Accepted 11 December 1998

Abstract

We adopt the Weber & Davis (1967) description of the dynamics of a magnetized isothermal outflow and add a constant source term to the continuity equation within a specified radius. Steady solutions to the outflow problem are calculated for various choices of free parameters. The fast-mode Mach numbers of fast-mode shocks in the mass-loading regions are calculated on the assumption that jump conditions must connect the preshock flow to the solution which passes smoothly through the fast-mode speed at the edge of the mass-loading region. Where the mass loading stagnates the flow, the fast-mode shock Mach numbers are often little greater than unity. The mass loading can result in the energy transport rate at the shock being reduced significantly from that in the gas at small radii. The results are of relevance to other divergent, magnetized, mass-loaded flows including those at boundary layers.

Key words: MHD – shock waves – ISM: magnetic fields

Send offprint requests to: R.J.R. Williams (rjrw@ast.leeds.ac.uk)

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© European Southern Observatory (ESO) 1999

Online publication: March 18, 1999
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