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MARCOS, a numerical tool for the simulation of multiple time-dependent non-linear diffusive shock acceleration
Ferrand G., Downes T., Marcowith A.
Monthly Notices of the Royal Astronomical Society 383 (2008) 41 - http://hal.archives-ouvertes.fr/hal-00177684
Physique/Astrophysique/Cosmologie et astrophysique extra-galactique
MARCOS, a numerical tool for the simulation of multiple time-dependent non-linear diffusive shock acceleration
Gilles Ferrand ()1, Turlough Downes2, Alexandre Marcowith ()3
1 :  CESR - Centre d'étude spatiale des rayonnements
CNRS : UMR5187 – Observatoire Midi-Pyrénées – INSU – Université Paul Sabatier (UPS) - Toulouse III
9 Av du colonel Roche - BP 4346 31028 TOULOUSE CEDEX 4
2 :  School of Mathematical Science
Dublin City University
Glasnevin, Dublin 9
3 :  LPTA - Laboratoire de Physique Théorique et Astroparticules
CNRS : UMR5207 – IN2P3 – Université Montpellier II - Sciences et techniques
Bât 13- 1er Et. - CC 070 Place Eugène Bataillon 34095 MONTPELLIER CEDEX 5
We present a new code aimed at the simulation of diffusive shock acceleration (DSA), and discuss various test cases which demonstrate its ability to study DSA in its full time-dependent and non-linear developments. We present the numerical methods implemented, coupling the hydrodynamical evolution of a parallel shock (in one space dimension) and the kinetic transport of the cosmic-rays (CR) distribution function (in one momentum dimension), as first done by Falle. Following Kang and Jones and collaborators, we show how the adaptive mesh refinement technique (AMR) greatly helps accommodating the extremely demanding numerical resolution requirements of realistic (Bohm-like) CR diffusion coefficients. We also present the paral lelization of the code, which allows us to run many successive shocks at the cost of a single shock, and thus to present the first direct numerical simulations of linear and non-linear multiple DSA, a mechanism of interest in various astrophysical environments such as superbubbles, galaxy clusters and early cosmological flows.

Monthly Notices of the Royal Astronomical Society
Publisher Oxford University Press (OUP): Policy P - Oxford Open Option A
ISSN 0035-8711 (eISSN : 1365-8711)
Articles dans des revues avec comité de lecture

cosmic-rays – acceleration of particles – numerical simulations
published in MNRAS by the Royal Astronomical Society and Blackwell Publishing

This work has been partly funded by the Egide and Enterprise Ireland Ulysses programme, and by the CosmoGrid project, funded under the Programme for Research in Third Level Institutions (PRTLI) administered by the Irish Higher Education Authority under the National Development Plan and with partial support from the European Regional Development Fund.
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marcos.bbl(7.7 KB)
marcos.tex(82 KB)
test1_hydro.eps(2.2 MB)
test1_kino_p.eps(97.3 KB)
test1_kino_t.eps(105 KB)
test1_shock.eps(49.1 KB)
test2_bench_amr.eps(37.5 KB)
test2_hydro_grids.eps(203 KB)
test2_kino_p.eps(97.6 KB)
test2_kino_t.eps(60.4 KB)
test2_shock.eps(42 KB)
test3_bench_para.eps(33.1 KB)
test3_multi_nl.eps(38.1 KB)
test3_multi_p.eps(258.1 KB)
test3_multi_t.eps(37.5 KB)
marcos.ps(3.4 MB)
marcos.pdf(846.6 KB)