Particle transport in complex flows

Conference item

This work presents new kinds of numerical schemes adapted to the transport and the acceleration of relativistic particles in complex multi-dimensional astrophysical flows. They use stochastic differential equations (SDE) equivalent to the diffusion-convection equation (DCE) for cosmic rays. The discretized SDE allows a time reconstruction of the particle distribution function of the relativistic particles. The method is first tested in ideal simple cases of shock acceleration with radiative losses. The ability of the different SDE schemes to solve more complex problems and their limitations are also addressed. The schemes are then applied to the transport of radio-emitting electrons in extragalactic jets. It is shown that a rescaling procedure for the diffusion coefficients can be used to compute of radiative jet structures. Finally, uses of the SDEs in conjunction with with 2D-3D (magneto-)hydrodynamical simulations are considered.

Authors: Marcowith, A; Kirk, J

• Publication status: Published
• Journal: PARTICLES AND FIELDS IN RADIO GALAXIES
• Volume: 250
• Pages: 340-344
• Publication date: 2002-01-01
• Event title: Oxford Radio Galaxy Workshop
• ISBN: 1583810900
• Keywords: SHOCK ACCELERATION; JETS