Numerical simulations of axially symmetric magnetized jets. I - The influence of equipartition magnetic fields. II - Apparent field structure and theoretical radio maps. III - Collimation of underexpanded jets by magnetic fields

Details Numerical simulations of axially symmetric magnetized jets. I - The influence of equipartition magnetic fields. II - Apparent field structure and theoretical radio maps. III - Collimation of underexpanded jets by magnetic fields Numerical simulations of axially symmetric magnetized jets. I - The influence of equipartition magnetic fields. II - Apparent field structure and theoretical radio maps. III - Collimation of underexpanded jets by magnetic fields

Mar 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...229..378k&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 229, no. 2, March 1990, p. 378-415. Research supported by Siemens AG.

Statistics

Computation

49

Computational Astrophysics, Magnetic Field Configurations, Magnetohydrodynamic Flow, Plasma Jets, Astronomical Models, Data Flow Analysis, Flow Distribution, Supersonic Jet Flow

Scientific paper

An investigation is presented of the influence of equipartition magnetic fields of various configuration on the propagation of a Mach 6 jet in pressure equilibrium and with a density 10 times smaller than the ambient medium. It is found that a purely poloidal equipartition field can decollimate the jet, while a purely toroidal equipartition field increases the confinement but introduces pinching waves. The results are used to compute theoretical radio maps and apparent field configurations projected onto a plane perpendicular to the line of sight. It is found that the apparent field structure of weak radio sources is explained by the projection of the true field configuration onto a plane perpendicular to the line of sight, and that it is unlikely that the X-like shock structures found in numerical simulations of supersonic jets produce the prominent knots observed in the jets of edge-darkened extragalactic radio sources. Finally, the role of magnetic fields in the stabilization of overpressured jets is demonstrated by another set of numerical simulations.

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