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A new time-dependent finite-difference method for relativistic shock acceleration.
- Source :
-
Monthly Notices of the Royal Astronomical Society . Mar2012, Vol. 420 Issue 4, p3360-3367. 8p. 7 Graphs. - Publication Year :
- 2012
-
Abstract
- ABSTRACT We present a new approach to calculate the particle distribution function about relativistic shocks including synchrotron losses using the method of lines with an explicit finite-difference scheme. A steady, continuous, one-dimensional plasma flow is considered to model thick (modified) shocks, leading to a calculation in three dimensions plus time, the former three being momentum, pitch angle and position. The method accurately reproduces the expected power-law behaviour in momentum at the shock for upstream flow speeds ranging from 0.1 c to 0.995 c (Γ∈ (1, 10]). It also reproduces approximate analytical results for the synchrotron cutoff shape for a non-relativistic shock, demonstrating that the loss process is accurately represented. The algorithm has been implemented as a hybrid OpenMP-MPI parallel algorithm to make efficient use of SMP cluster architectures and scales well up to many hundreds of CPUs. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00358711
- Volume :
- 420
- Issue :
- 4
- Database :
- Academic Search Index
- Journal :
- Monthly Notices of the Royal Astronomical Society
- Publication Type :
- Academic Journal
- Accession number :
- 72366438
- Full Text :
- https://doi.org/10.1111/j.1365-2966.2011.20257.x