Magnetic field evolution in relativistic unmagnetized collisionless shocks

Details Magnetic field evolution in relativistic unmagnetized collisionless shocks Magnetic field evolution in relativistic unmagnetized collisionless shocks

2008-02-22

arxiv.org/abs/0802.3217v2

Astrophys.J.693:L127-L130,2009; Astrophys.J.Lett.693:L127-L130,2009

Astronomy and Astrophysics

Astrophysics

ApJ Letters, published (minor corrections, results unchanged)

Scientific paper

10.1088/0004-637X/693/2/L127

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 >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 >1% and >10% of the downstream energy flux, respectively. Our results suggest limits on the magnetization of relativistic astrophysical flows.

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