Utilize este identificador para referenciar este registo:
http://hdl.handle.net/10071/14366
Autoria: | Martins, S. F. Fonseca, R. A. Silva, L. O. Mori, W. B. |
Data: | 2009 |
Título próprio: | Ion dynamics and acceleration in relativistic shocks |
Volume: | 695 |
Número: | 2 |
Paginação: | 189-193 |
ISSN: | 2041-8205 |
DOI (Digital Object Identifier): | 10.1088/0004-637X/695/2/L189 |
Palavras-chave: | Acceleration of particles Gamma rays: bursts Methods: numerical |
Resumo: | Ab initio numerical study of collisionless shocks in electron-ion unmagnetized plasmas is performed with fully relativistic particle in cell simulations. The main properties of the shock are shown, focusing on the implications for particle acceleration. Results from previous works with a distinct numerical framework are recovered, including the shock structure and the overall acceleration features. Particle tracking is then used to analyze in detail the particle dynamics and the acceleration process. We observe an energy growth in time that can be reproduced by a Fermi-like mechanism with a reduced number of scatterings, in which the time between collisions increases as the particle gains energy, and the average acceleration efficiency is not ideal. The in depth analysis of the underlying physics is relevant to understanding the generation of high-energy cosmic rays, the impact on the astrophysical shock dynamics, and the consequent emission of radiation. |
Arbitragem científica: | yes |
Acesso: | Acesso Aberto |
Aparece nas coleções: | CTI-RI - Artigos em revistas científicas internacionais com arbitragem científica |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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Ion dynamics and acceleration in relativistic shocks.pdf | 1,02 MB | Adobe PDF | Ver/Abrir |
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