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| Paper: |
Simulation of Relativistic Jets and Associated Self-consistent Radiation |
| Volume: |
459, 6th International Conference of Numerical Modeling of Space Plasma Flows (ASTRONUM 2011) |
| Page: |
143 |
| Authors: |
Nishikawa, K.-I.; Choi, E.-J.; Min, K.; Hardee, P.; Mizuno, Y.; Zhang, B.; Niemiec, J.; Medvedev, M.; Nordlund, A.; Frederiksen, J.; Sol, H.; Pohl, M.; Hartmann, D. H.; Fishman, J. F. |
| Abstract: |
Plasma instabilities excited in collisionless shocks are responsible for particle acceleration. We have investigated the particle acceleration and shock structure
associated with an unmagnetized relativistic electron-positron jet propagating into an unmagnetized electron-positron plasma. Cold jet electrons are thermalized
and slowed while the ambient electrons are swept up to create a partially developed hydrodynamic-like shock structure. In the leading shock, electron density
increases by a factor of about 3.5 in the simulation frame. Strong electromagnetic fields are generated in the trailing shock and provide an emission site.
These magnetic fields contribute to the electron's transverse deflection behind the shock. Our initial results of a jet-ambient
interaction with anti-parallel magnetic fields show pile-up of magnetic fields at the colliding shock, which may lead to reconnection
and associated particle acceleration. We will investigate the radiation in a transient stage as a possible generation mechanism of
precursors of prompt emission. In our simulations we calculate the radiation from electrons in the shock region.
The detailed properties of this radiation are important for understanding the complex time evolution and spectral
structure in gamma-ray bursts, relativistic jets, and supernova remnants. |
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