Journal
ASTROPHYSICAL JOURNAL LETTERS
Volume 693, Issue 2, Pages L127-L130Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/693/2/L127
Keywords
acceleration of particles; gamma rays: bursts; magnetic fields; shock waves
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Funding
- NSF [PHY-0503584]
- AEC
- ISF
- Minerva grants
- Alfred P. Sloan Foundation Fellowship
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [0807381] Funding Source: National Science Foundation
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We study relativistic unmagnetized collisionless shocks using unprecedentedly large particle-in-cell simulations of two-dimensional pair plasma. High-energy particles accelerated by the shock are found to drive magnetic field evolution on a timescale greater than or similar to 10(4) plasma times. Progressively stronger magnetic fields are generated on larger scales in a growing region around the shock. Shock-generated magnetic fields and accelerated particles carry greater than or similar to 1% and greater than or similar to 10% of the downstream energy flux, respectively. Our results suggest limits on the magnetization of relativistic astrophysical flows.
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