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view Abstract Citations (2) References (21) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Magnetohydrodynamic Models for Extragalactic Jets. I. General Method Based on Conservation Laws Pietrini, Paola ; Torricelli-Ciamponi, Guidetta Abstract Recently an attempt has been made to model large-scale extragalactic jets as cylindrically symmetric flows of thermal matter, endowed with magnetic fields consistently generated by a system of currents flowing within the jet. The widening of observed radio structures and the longitudinal variations of polarization properties were ascribed to the superposed relativistic particle component, modeled with conical geometry. This simple model turned out to give a reasonable description of FR I jets. In this work a dependence of the thermal and magnetic structure on the distance z along the jet axis is introduced in the model, maintaining its basic features and hypotheses. This approach is suggested both by the fact that physical conditions in the ambient medium may vary along the jet length and by the need to reproduce polarization properties with a magnetic structure which is in principle stable. A general method based on the use of MHD conservation laws is introduced to build up a steplike model; the jet is represented as a sequence of purely cylindrical "segments," whose physical properties are related through the conservation laws, allowing for the existence of intervening zones in which physical quantities also depend on z. In this paper the method is applied to the study of the magnetic structure in a region near the end of the large-scale jet, starting from a given configuration at its beginning, thus building up a "two-step" model; magnetic structures that, singly taken, are basically stable are considered. Polarization distributions predicted by the model are calculated; the results indicate that changing the magnetic configuration along the jet allows reproduction of FR I jet polarization features without invoking highly wound up helical fields, which were shown to be quite unstable in previous work. Publication: The Astrophysical Journal Pub Date: December 1992 DOI: 10.1086/172038 Bibcode: 1992ApJ...401...60P Keywords: Magnetohydrodynamics; Radio Jets (Astronomy); Relativistic Particles; Astronomical Models; Conservation Laws; Extragalactic Radio Sources; Magnetic Field Configurations; Polarization (Waves); Astrophysics; GALAXIES: JETS; MAGNETOHYDRODYNAMICS: MHD full text sources ADS | Related Materials (1) Part 2: 1993ApJ...406...36T
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