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July 29, 2015 to August 6, 2015
World Forum
Europe/Amsterdam timezone

Transport of magnetic turbulence in supernova remnants

Aug 4, 2015, 4:00 PM
1h
Amazon Foyer (World Forum)

Amazon Foyer

World Forum

Churchillplein 10 2517 JW Den Haag The Netherlands
Board: 188
Poster contribution CR-TH Poster 3 CR

Speaker

Robert Brose (DESY)

Description

Supernova remnants are known as sources of galactic cosmic rays by their nonthermal emission of radio waves, X rays, and gamma rays. However, many theoretical models fail to reproduce the observed soft spectra and the spectral breaks. We model cosmic-ray acceleration in a time-dependent and self consistent way by simultaneously solving the CR transport equation and a transport equation for isotropic Alfvenic turbulence. The CR transport equation is solved in a test-particle approach combined with 1-D hydrodynamical simulations of the remnant evolution, as described in Telezhinsky et al. (2012). In the transport equation for scattering turbulence we only consider upstream and downstream moving Alfven waves, and their spectral power density determines the spatial diffusion coefficient of cosmic rays. Our shock centered, expanding grid extends upstream to several shock radii. Thus we are not limited by a free escape boundary and are able to self-consistently study the escape of CR from the acceleration side. We demonstrate that the system is typically not in a steady state. In fact, even after several thousand years of evolution, no equilibrium situation is reached. The resulting time-dependent particle spectra calculated by us differ strongly from those derived assuming a steady state. Our results further indicate that the escape of particles is crucial for the formation of soft spectra and spectral breaks, as observed.
Registration number following "ICRC2015-I/" 1092
Collaboration -- not specified --

Primary author

Co-authors

Alina Wilhelm (DESY) Igor Telezhinsky (Astronomical Observatory of Kiev University) Martin Pohl (DESY)

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