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Title: RECOLLIMATION SHOCKS IN MAGNETIZED RELATIVISTIC JETS

We have performed two-dimensional special-relativistic magnetohydrodynamic simulations of non-equilibrium over-pressured relativistic jets in cylindrical geometry. Multiple stationary recollimation shock and rarefaction structures are produced along the jet by the nonlinear interaction of shocks and rarefaction waves excited at the interface between the jet and the surrounding ambient medium. Although initially the jet is kinematically dominated, we have considered axial, toroidal, and helical magnetic fields to investigate the effects of different magnetic-field topologies and strengths on the recollimation structures. We find that an axial field introduces a larger effective gas pressure and leads to stronger recollimation shocks and rarefactions, resulting in larger flow variations. The jet boost grows quadratically with the initial magnetic field. On the other hand, a toroidal field leads to weaker recollimation shocks and rarefactions, significantly modifying the jet structure after the first recollimation rarefaction and shock. The jet boost decreases systematically. For a helical field, instead, the behavior depends on the magnetic pitch, with a phenomenology that ranges between the one seen for axial and toroidal magnetic fields, respectively. In general, however, a helical magnetic field yields a more complex shock and rarefaction substructure close to the inlet that significantly modifies the jet structure. The differences in shockmore » structure resulting from different field configurations and strengths may have observable consequences for disturbances propagating through a stationary recollimation shock.« less
Authors:
;  [1] ;  [2] ;  [3] ;  [4] ;  [5]
  1. Institute for Theoretical Physics, Goethe University, D-60438, Frankfurt am Main (Germany)
  2. Instituto de Astrofísica de Andalucía (CSIC), Apartado 3004, E-18080 Granada (Spain)
  3. Department of Physics, University of Alabama in Huntsville, Huntsville, AL 35899 (United States)
  4. Department of Physics and Astronomy, University of Gent, Proeftuinstraat 86 B-9000, Gent (Belgium)
  5. Department of Physics and Astronomy, The University of Alabama, Tuscaloosa, AL 35487 (United States)
Publication Date:
OSTI Identifier:
22525624
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 809; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; COMPUTERIZED SIMULATION; CYLINDRICAL CONFIGURATION; DISTURBANCES; EQUILIBRIUM; GALAXIES; INTERSTELLAR MAGNETIC FIELDS; JETS; MAGNETOHYDRODYNAMICS; NONLINEAR PROBLEMS; RELATIVISTIC RANGE; SHOCK WAVES; VARIATIONS