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Astrophysics and Space Science

, Volume 322, Issue 1–4, pp 3–9 | Cite as

Launching mechanisms of astrophysical jets

  • Attilio Ferrari
  • Petros Tzeferacos
  • Claudio Zanni
Original Article

Abstract

The combination of accretion disks and supersonic jets is used to model many active astrophysical objects, viz., young stars, relativistic stars, and active galactic nuclei. However, existing theories on the physical processes by which these structures transfer angular momentum and energy from disks to jets through viscous or magnetic torques are still relatively approximate. Global stationary solutions do not permit understanding the formation and stability of these structures; and global numerical simulations that include both the disk and jet physics are often limited to relatively short time scales and astrophysically out-of-range values of viscosity and resistivity parameters that are instead crucial to defining the coupling of the inflow/outflow dynamics. Along these lines we discuss self-consistent time-dependent simulations of the launching of supersonic jets by magnetized accretion disks, using high resolution numerical techniques. We shall concentrate on the effects of the disk physical parameters, and discuss under which conditions steady state solutions of the type proposed in the self-similar models of Blandford and Payne can be reached and maintained in a self-consistent nonlinear stationary state.

Keywords

Jets Accretion disks Magnetohydrodynamics Numerical simulations 

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Copyright information

© Springer Science+Business Media B.V. 2009

Authors and Affiliations

  • Attilio Ferrari
    • 1
    • 2
  • Petros Tzeferacos
    • 2
  • Claudio Zanni
    • 3
  1. 1.Department of Astronomy and AstrophysicsUniversity of ChicagoChicagoUSA
  2. 2.Dipartimento di Fisica GeneraleUniversità di TorinoTurinItaly
  3. 3.Laboratoire d’Astrophysique de GrenobleGrenobleFrance

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